Watch Andres' Voki tell you how to solve number one on the homework.
Get a Voki now!
I will now walk you through solving number two.
42x30
Remember to ignore the zero, we can always put it at the end of the answer.
So this leaves us with
42
x 3
3 times 2 is 6
42
x 3
6
3 times 4 is 12
42
x 3
126
Now we add the zero to the end and ger
1,260 as our answer!
Tuesday, November 9, 2010
Monday, November 8, 2010
Mental Math R 5-1
Multiplying with Multiples of 10
Listen to the wizard explain how to do number one.
Get a Voki now!
I'll walk you through number two.
5x3
That shouldn't take you very long, it's an easy one!
15
:)
5x30
If we see a zero like that, we can ignore it for now, and just add it to the back of the answer at the end.
If we ignore the zero, we are left with 5x3, which we just did and found out was 15.
When we put the zero on the end we have an answer of 150.
500x300
Lots of zeros here! Four to be exact. If we ignore all four of them, we have to remember to add four to the end of the answer.
We again are left with 5x3, which is still 15.
But when we add the four zeros onto the end we get an answer of 150,000.
Listen to the wizard explain how to do number one.
Get a Voki now!
I'll walk you through number two.
5x3
That shouldn't take you very long, it's an easy one!
15
:)
5x30
If we see a zero like that, we can ignore it for now, and just add it to the back of the answer at the end.
If we ignore the zero, we are left with 5x3, which we just did and found out was 15.
When we put the zero on the end we have an answer of 150.
500x300
Lots of zeros here! Four to be exact. If we ignore all four of them, we have to remember to add four to the end of the answer.
We again are left with 5x3, which is still 15.
But when we add the four zeros onto the end we get an answer of 150,000.
Tuesday, October 26, 2010
14-1 Problem Solving
YAY WORD PROBLEMS AGAIN!
Basically, all you need to do is find the fraction/decimal in word form, and then write it into either a fraction or decimal, depending on what the question is asking for.
Hundreds Tens Ones . Tenths Hundredths
#1) Three-tenths - They want it written in decimal form.
.3
#2) Half - They want it in both fraction and decimal form.
1/2 and .5
#3) Nine-Hundredths - They want it in decimal form.
.09
Basically, all you need to do is find the fraction/decimal in word form, and then write it into either a fraction or decimal, depending on what the question is asking for.
Hundreds Tens Ones . Tenths Hundredths
#1) Three-tenths - They want it written in decimal form.
.3
#2) Half - They want it in both fraction and decimal form.
1/2 and .5
#3) Nine-Hundredths - They want it in decimal form.
.09
Friday, October 22, 2010
8-1 Problem Solving
AHHHH Word Problems!!!
#1 There are 20 members and 47 posters. They even told you what to do when they said 'divide'!
We haven't done two digit division yet, BUT, you can still walk through this one.
COunt by 20's until you get to 47 without going over.
20, 40, 60...Stop at 40 because 60 is too big. That took us 2 counts to get to 40. Now write a 40 underneath the 47 and subtract, you should get 7. We can't count by 20's to get to 7, because 20 is too big. So there are 7 remainders. The final count will be that each member will get 2 posters and there will be 7 posters left over.
#2 SAME AS #1!
There are 43 members and they need to be DIVIDED into groups of 10. Let's count by 10's until we get to 43 or close to it without going over.
10, 20, 30, 40, 50...Stop at 40 because 50 is too big! That too us 4 counts. Write the 40 underneath the 43 and subtract. You should get 3 left over, because you cannot count by 10's to get to 3. SOOOO There will be 4 groups with 3 people extra.
#3 SAME AS #1 AND#2!
There are 20 members and they each need to do the same number of reports. If there are 53 reports we need to DIVIDE them equally among the members. Let's count by 20's until we get to 53 or close to it without going over.
20, 40, 60....Stop at 40 because 60 is too big! That too 2 counts. Now write 40 underneath 53 and subtract. You should get 13. This means that each member will do 2 reports with 13 extras!
#1 There are 20 members and 47 posters. They even told you what to do when they said 'divide'!
We haven't done two digit division yet, BUT, you can still walk through this one.
COunt by 20's until you get to 47 without going over.
20, 40, 60...Stop at 40 because 60 is too big. That took us 2 counts to get to 40. Now write a 40 underneath the 47 and subtract, you should get 7. We can't count by 20's to get to 7, because 20 is too big. So there are 7 remainders. The final count will be that each member will get 2 posters and there will be 7 posters left over.
#2 SAME AS #1!
There are 43 members and they need to be DIVIDED into groups of 10. Let's count by 10's until we get to 43 or close to it without going over.
10, 20, 30, 40, 50...Stop at 40 because 50 is too big! That too us 4 counts. Write the 40 underneath the 43 and subtract. You should get 3 left over, because you cannot count by 10's to get to 3. SOOOO There will be 4 groups with 3 people extra.
#3 SAME AS #1 AND#2!
There are 20 members and they each need to do the same number of reports. If there are 53 reports we need to DIVIDE them equally among the members. Let's count by 20's until we get to 53 or close to it without going over.
20, 40, 60....Stop at 40 because 60 is too big! That too 2 counts. Now write 40 underneath 53 and subtract. You should get 13. This means that each member will do 2 reports with 13 extras!
Monday, October 18, 2010
8-5 Two-Digit Quotients
Don't forget that QUOTIENT is the answer to a division problem.
I've added a picture walk-through from tutorvista.com to solve a division problem.
Friday, October 15, 2010
8-2 Divide multiples of 10, 100, and 1,000
This idea really only needs you to know your basic multiplication facts, the rest if just adding zeros.
#1) 300 divided by 6.
I want you to draw a line cutting the number 300 into two pieces; 30 and 0. Now that we've narrowed things down, let's count by 6's until we get to thirty. 6, 12, 18, 24, 30. That took us 5 times. Write a 5 above the thirty, and the number 30 underneath. Don't forget to subtract the 30 and 30. That's easy, you get 0. Now that poor other zero is there all by himself. You can't count by 6's until you get to 0, that's silly. Think of it this way, 3 times what gives you 0? 0! So write that 0 on top as well. And you get an answer of 50.
#16) The input output table
The directions for this one tells us to divide by 5. The first input number is 1,500. According to the directions, we need to divide 1,500 by 5. Draw this with the 1,500 under the house and the 5 outside the front door. I sure hope you understand what that means. Now draw a line cutting 1,500 into two pieces; 15 and 00. Super easy now. Count by 5's until you get to 15. 3! Add in your filler zeros above the other two, giving you the answer 300!
#17)61 divided by 3.
Re-write this problem with the 61 inside the house and the 3 outside. Now cut the 61 in half with a line. Super easy now! Count by 3's until you get to 6. 3, 6. That took us 2 times. So write a 2 above the 6, and the 6 below the 6. Now subtract the 6 and 6. We get Zero. BUT! That poor 1 is all by himself. Bring him down, now let's count by 6's until we get to 1. Uh-oh, can't do it. Now listen very carefully. You HAVE to put a 0 above the 1, because we can't leave that place value empty. So far we now have 20 as our answer, but that pesky left over 1 needs to be a remainder. So your final answer is 20 r1
#1) 300 divided by 6.
I want you to draw a line cutting the number 300 into two pieces; 30 and 0. Now that we've narrowed things down, let's count by 6's until we get to thirty. 6, 12, 18, 24, 30. That took us 5 times. Write a 5 above the thirty, and the number 30 underneath. Don't forget to subtract the 30 and 30. That's easy, you get 0. Now that poor other zero is there all by himself. You can't count by 6's until you get to 0, that's silly. Think of it this way, 3 times what gives you 0? 0! So write that 0 on top as well. And you get an answer of 50.
#16) The input output table
The directions for this one tells us to divide by 5. The first input number is 1,500. According to the directions, we need to divide 1,500 by 5. Draw this with the 1,500 under the house and the 5 outside the front door. I sure hope you understand what that means. Now draw a line cutting 1,500 into two pieces; 15 and 00. Super easy now. Count by 5's until you get to 15. 3! Add in your filler zeros above the other two, giving you the answer 300!
#17)61 divided by 3.
Re-write this problem with the 61 inside the house and the 3 outside. Now cut the 61 in half with a line. Super easy now! Count by 3's until you get to 6. 3, 6. That took us 2 times. So write a 2 above the 6, and the 6 below the 6. Now subtract the 6 and 6. We get Zero. BUT! That poor 1 is all by himself. Bring him down, now let's count by 6's until we get to 1. Uh-oh, can't do it. Now listen very carefully. You HAVE to put a 0 above the 1, because we can't leave that place value empty. So far we now have 20 as our answer, but that pesky left over 1 needs to be a remainder. So your final answer is 20 r1
Thursday, October 14, 2010
8-1 Division with Remainders
*Note: you can solve these on a seperate sheet of paper. You might find yourself running out of room on the homework sheet.
**Note: #17-22 involve double digit multiplication. We have not learned this skill yet. You may skip it if you'd like, or you can use a calculator to solve it.
Oh yes, that dreaded division. :)
We have to know our multiplication facts in order to do this properly.
Step by Step of the above problem. We are solving 10 divided by 3. Sing your three's until you get as close to 10 as possible without going over. 3, 6, 9. We stop there because if we kept going the next number would have been 12, and that's too much. So we write a 3 on top and a 9 underneath. You will then subtract the 10 and 9, giving you 1. Now you can't sing your three's until you get to 1, that's just silly. You now have the answer, 3 with a remainder of 1.
Let's try some on the homework.
#1) 56 divided by 6.
Sing your 6's until you get as close to 56 as you can. 6, 12, 18, 24, 30, 36, 42, 48, 54. We stop there because if we kept going the next number would have been 60, and that's too big. Write a 9 on top and a 54 underneath. Subtract 56 and 54. You will get 2. Now you can't count by 6's until you get to 2, that's just silly. So you'll have that 2 as a remainder. Your answer 9 r2
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