SME
Grade 3 Math · Problem type
Two-step problems: multiply, then add
Use this for “3 boxes of 8 crayons and 5 more. How many in all?”
Diagram
3 × 8 = 24 in the boxes.
Add 5: 29 in all.
Boxes: 3
In each box: 8
This is an example. Type your own values to start a new problem.
Boxes
×
In each box
+
Extra
=
Total
In the boxes
worked out (not typed)
Formulas
3 × 8 = 24
Boxes × in each box = in the boxes
24 + 5 = 29
In the boxes + extra = total
Assumptions
•
First multiply to find how many are in the equal groups. Then add the extra.
•
Check: put the answer back in the story. Does each step still fit?
Step-by-step
WE KNOW
Extra: 5
Boxes: 3
In each box: 8
FIND
in the boxes, total
Step 1 · Find in the boxes
3 × 8 = ?
Boxes × in each box = in the boxes
Multiply the boxes by the number in each box.
Count by 8s, 3 times: 8, 16, 24 → 24
In the boxes = 24
Step 2 · Find total
24 + 5 = ?
In the boxes + extra = total
Add the number in the boxes and the extra.
Total = 29
Check
Put the numbers back in. Both sides should match.
3 × 8 = 24 ✓
24 + 5 = 29 ✓
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Two-step problems: add, then divide
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Two-step problems: subtract, then divide
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