SME
Grade 3 Math · Problem type
Word problems with multiples of 10
Use this for “8 boxes of 40 pencils. How many pencils?”
Diagram
8 groups of 4 tens
320 in all
Tens in each box: 4
Tens of pencils: 32
This is an example. Type your own values to start a new problem.
Boxes
×
Pencils in each box
=
Pencils
Tens in each box
worked out (not typed)
Tens of pencils
worked out (not typed)
Formulas
40 is 4 tens
Pencils in each box ÷ 10 = tens in each box
8 × 4 = 32
Boxes × tens in each box = tens of pencils
32 tens = 320
Tens of pencils × 10 = pencils
Assumptions
•
Each box holds a number of tens: 40 is 4 tens.
•
Multiply by the tens: 8 × 4 tens = 32 tens, and 32 tens is 320.
Step-by-step
WE KNOW
Boxes: 8
Pencils in each box: 40
FIND
tens in each box, tens of pencils, pencils
Step 1 · Find tens in each box
40 is ? tens
Pencils in each box ÷ 10 = tens in each box
Say the multiple of 10 as tens.
Tens in each box = 40 ÷ 10
40 is 4 tens
Tens in each box = 4
Step 2 · Find tens of pencils
8 × 4 = ?
Boxes × tens in each box = tens of pencils
Multiply the boxes by the tens in each box.
5 × 4 = 20 and 3 × 4 = 12
20 + 12 = 32
Tens of pencils = 32
Step 3 · Find pencils
32 tens = ?
Tens of pencils × 10 = pencils
Say the tens as a number.
Pencils = 32 × 10
32 tens = 320
Pencils = 320
Check
Put the numbers back in. Both sides should match.
40 is 4 tens ✓
8 × 4 = 32 ✓
32 tens = 320 ✓
Topic check
See what you know: 5 questions on this topic
New questions each time. Pass to mark it complete.