SME
Grade 3 Math · Problem type
Divide by breaking apart
Use this for “72 chairs in 4 equal rows: how many in each row?” past the facts.
Diagram
40 + 32 = 72.
72 ÷ 4 = 18: 10 + 8.
This is an example. Type your own values to start a new problem.
Total
÷
Equal groups
=
In each group
Formulas
72 ÷ 4 = 18
Total ÷ equal groups = in each group
Assumptions
•
Break the total into a part you can share by tens and a part you know: 72 = 40 + 32.
•
Share each part: 40 ÷ 4 = 10 and 32 ÷ 4 = 8. Add the answers: 10 + 8 = 18.
•
Totals to 100, shared into 2 to 9 equal groups.
Step-by-step
WE KNOW
Total: 72
Equal groups: 4
FIND
in each group
Step 1 · Find in each group
72 ÷ 4 = ?
Total ÷ equal groups = in each group
Break the total into a part that gives tens in each group and a part you know. Share each part, then add.
72 = 40 + 32
40 ÷ 4 = 10
32 ÷ 4 = 8
10 + 8 = 18
In each group = 18
Check
Put the numbers back in. Both sides should match.
4 × 18 = 72 ✓
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