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Multiply 2-digit Numbers Lesson 10.3
Watch and listen to the steps… Harcourt
Solve use a strategy called Regrouping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Multiplication Steps Step 1: Multiply the ones. 4 x 9 = 36 ones.  Regroup the 36 ones as 3 tens and 6 ones. Step 2: Multiply the tens.  4 x 5 tens = 20 tens.  Add the regrouped tens.  20 tens + 3 tens = 23 tens.  Regroup the 24 tens as 2 hundreds and 4 tens.  9 5 6 3 2 4 x 3 O T H
42 x 7 Step 1: Multiply the ones. 7 x 2 = 14 ones.  Regroup the 14 ones as 1 tens and 4 ones. Step 2: Multiply the tens.  7 x 4 tens = 28 tens.  Add the regrouped tens.  28 tens + 1 ten = 29 tens.  Regroup the 29 tens as 2 hundreds and 9 tens.  2 4 4 9 2 7 x 1 O T H
23 x 5 Step 1: Multiply the ones. 5 x 3 = 15 ones.  Regroup the 15 ones as 1 ten and 5 ones. Step 2: Multiply the tens.  5 x 2 tens = 10 tens.  Add the regrouped tens.  10 tens + 1 ten = 11 tens.  Regroup the 11 tens as 1 hundred and 1 ten.  3 2 5 1 1 5 x 1 O T H
58 x 6 Step 1: Multiply the ones. 6 x 8 = 48 ones.  Regroup the 48 ones as 4 tens and 8 ones. Step 2: Multiply the tens.  6 x 5 tens = 30 tens.  Add the regrouped tens.  30 tens + 4 tens =  34 tens.  Regroup the 34 tens as 3 hundreds and 4 tens.  8 5 8 1 1 6 x 4 O T H
72 x 8 Step 1: Multiply the ones. 8 x 2 = 16 ones.  Regroup the 16 ones as 1 ten and 6 ones. Step 2: Multiply the tens.  8 x 7 tens = 56 tens.  Add the regrouped tens.  56 tens + 1 ten =  57 tens.  Regroup the 57 tens as 5 hundreds and 7 tens.  2 7 6 7 5 8 x 1 O T H

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Math10.3

  • 2. Watch and listen to the steps… Harcourt
  • 3.
  • 4. Multiplication Steps Step 1: Multiply the ones. 4 x 9 = 36 ones. Regroup the 36 ones as 3 tens and 6 ones. Step 2: Multiply the tens. 4 x 5 tens = 20 tens. Add the regrouped tens. 20 tens + 3 tens = 23 tens. Regroup the 24 tens as 2 hundreds and 4 tens. 9 5 6 3 2 4 x 3 O T H
  • 5. 42 x 7 Step 1: Multiply the ones. 7 x 2 = 14 ones. Regroup the 14 ones as 1 tens and 4 ones. Step 2: Multiply the tens. 7 x 4 tens = 28 tens. Add the regrouped tens. 28 tens + 1 ten = 29 tens. Regroup the 29 tens as 2 hundreds and 9 tens. 2 4 4 9 2 7 x 1 O T H
  • 6. 23 x 5 Step 1: Multiply the ones. 5 x 3 = 15 ones. Regroup the 15 ones as 1 ten and 5 ones. Step 2: Multiply the tens. 5 x 2 tens = 10 tens. Add the regrouped tens. 10 tens + 1 ten = 11 tens. Regroup the 11 tens as 1 hundred and 1 ten. 3 2 5 1 1 5 x 1 O T H
  • 7. 58 x 6 Step 1: Multiply the ones. 6 x 8 = 48 ones. Regroup the 48 ones as 4 tens and 8 ones. Step 2: Multiply the tens. 6 x 5 tens = 30 tens. Add the regrouped tens. 30 tens + 4 tens = 34 tens. Regroup the 34 tens as 3 hundreds and 4 tens. 8 5 8 1 1 6 x 4 O T H
  • 8. 72 x 8 Step 1: Multiply the ones. 8 x 2 = 16 ones. Regroup the 16 ones as 1 ten and 6 ones. Step 2: Multiply the tens. 8 x 7 tens = 56 tens. Add the regrouped tens. 56 tens + 1 ten = 57 tens. Regroup the 57 tens as 5 hundreds and 7 tens. 2 7 6 7 5 8 x 1 O T H