Multiplying Two and Three Digit Numbers by a One Digit Number

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Multiplying Two- and Three- Digit Numbers by a
One- Digit Number
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Step 1 Think about 3 groups of 24.
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Step 2 Multiply the ones.
Think 4 x 3 12
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Step 3 Regroup 12 ones as 1 ten and 2 ones.
Write down the ones. Carry the tens.
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2
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Step 4 Then multiply the bottom ones times the
tens. Add in the one ten you carried over.
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Think 6 tens 1 ten 7 tens
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Step 5 Your final answer is 72.
Lets try another problem!
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Step 1 Think about 5 groups of 45.
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Step 2 Multiply the ones.
Think 5 x 5 25
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Step 3 Regroup 25 ones as 2 tens and 5 ones.
Write down the ones. Carry the tens.
2
5
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Step 4 Then multiply the bottom ones times the
tens. Add in the two ten you carried over.
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Think 20 tens 2 tens 22
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Step 5 Your final answer is 225.
Lets try a harder problem!
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Step 1 Think about 4 groups of 364.
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Step 2 Multiply the ones.
Think 4 x 4 16
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Step 3 Regroup 16 ones as 1 ten and 6 ones.
Write down the ones. Carry the tens.
1
6
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Step 4 Then multiply the bottom ones times the
tens. Add in the one ten you carried over.
Think 24 tens 1 ten 25 tens
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Step 5 Regroup 25 tens as two hundreds and five
tens. Write down the tens. Carry the hundreds.
2
5
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Step 6 Then multiply the bottom ones times the
hundreds. Add in the two hundreds you carried
over.
Think 12 hundreds 2 hundreds 14
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Step 7 Your final answer is 1,456.
Now try some on your own!