Math10.3

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Math10.3

  1. 1. Multiply 2-digit Numbers Lesson 10.3
  2. 2. Solve use a strategy called Regrouping <ul><li>STEP 1 </li></ul><ul><li>Multiply the ones. Put the tens ( 3 ) above the tens place. </li></ul><ul><li>3 </li></ul><ul><li>1 6 </li></ul><ul><li>x 5 </li></ul><ul><li>0 </li></ul><ul><li>STEP 2 </li></ul><ul><li>Multiply the tens, then add the regrouped 3 to the product. </li></ul><ul><li>3 </li></ul><ul><li>1 6 </li></ul><ul><li>x 5 </li></ul><ul><li>8 0 </li></ul>
  3. 3. 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. H T O 3 5 9 x 4 2 3 6
  4. 4. 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. H T O 1 4 2 x 7 2 9 4
  5. 5. 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. H T O 1 2 3 x 5 1 1 5
  6. 6. 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. H T O 4 5 8 x 6 1 1 8
  7. 7. 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. H T O 1 7 2 x 8 5 7 6

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