Monday, November 15, 2010

Multiply by Two-Digit Numbers Reteach 3.7

Listen to Jakayla's Voki explain how to go through number 1 on your homework. If it talks too fast you can pause it or listen to it again.

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I'll walk you through solving number 2.
68 times 24
Make sure you draw arrows to help you remember what you are doing.

Step 1:
4 times 8
4x8 = 32
Write the 2 under the problem and regroup(carry) the 3.

Step 2:
4 times 6
4x6 = 24
Don't forget to add the regrouped number, 3
24 plus 3
24+3 = 27
Write 27 under the problem

This gives the first row an answer of 272

Step 3:
Skip down, under 272, write a zero

Step 4:
Multiply 2 times 8
2x8 = 16
Write the 6 under the 7, and regroup(carry) the 1 over the 6 (make sure that you crossed out the 3 from the previous regrouping.

Step 5:
Multiply 2 times 6
2x6 = 12
Don't forget to add the regrouped number (1)
12 plus 1
12+1 = 13
Write the 13 under the first row.

This gives our second row a total of 1,360

Step 6:
Add the first row and the second row
272 plus 1,360

272
+1360

TOTAL 1,632

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