SME
Grade 3 Math · Number & Base Ten
Multiply by multiples of 10
Use this for “What is 4 × 60?” Think of it as 4 × 6 tens.
Diagram
4 groups of 6 tens
240 in all
Tens in the multiple of 10: 6
Tens in the answer: 24
This is an example. Type your own values to start a new problem.
One-digit number
×
Multiple of 10
=
Product
Tens in the multiple of 10
worked out (not typed)
Tens in the answer
worked out (not typed)
Formulas
60 is 6 tens
Multiple of 10 ÷ 10 = tens in the multiple of 10
4 × 6 = 24
One-digit number × tens in the multiple of 10 = tens in the answer
24 tens = 240
Tens in the answer × 10 = product
Assumptions
•
A multiple of 10 is a number of tens: 80 is 8 tens.
•
Multiply by the tens: 4 × 6 tens = 24 tens.
•
24 tens is 240.
Step-by-step
WE KNOW
One-digit number: 4
Multiple of 10: 60
FIND
tens in the multiple of 10, tens in the answer, product
Step 1 · Find tens in the multiple of 10
60 is ? tens
Multiple of 10 ÷ 10 = tens in the multiple of 10
Say the multiple of 10 as tens.
Tens in the multiple of 10 = 60 ÷ 10
60 is 6 tens
Tens in the multiple of 10 = 6
Step 2 · Find tens in the answer
4 × 6 = ?
One-digit number × tens in the multiple of 10 = tens in the answer
Multiply the number by the tens.
Double 6: 6 + 6 = 12
Double again: 12 + 12 = 24
Tens in the answer = 24
Step 3 · Find product
24 tens = ?
Tens in the answer × 10 = product
Say the tens as a number.
Product = 24 × 10
24 tens = 240
Product = 240
Check
Put the numbers back in. Both sides should match.
60 is 6 tens ✓
4 × 6 = 24 ✓
24 tens = 240 ✓
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Word problems with multiples of 10
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