SME
Grade 2 Math · Problem type
Count back by 5s, 10s and 100s
Use this to count back by 5s, 10s or 100s.
Picture
560, 550, 540, 530
Start: 560
Count back by: 10
Number of jumps: 3
Number reached: 530
This is an example. Type the numbers from your problem to start.
Start
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Count back by
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Number of jumps
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Number reached
answer
Number sentences
Start at 560. After 3 jumps back by 10, you land on 530.
Good to know
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Counting back takes away the same number each time.
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Back by 10s from 560: 550, 540, 530. The ones digit stays the same.
Step-by-step
WE KNOW
Start: 560
Number of jumps: 3
Count back by: 10
FIND
number reached
Step 1 · Find number reached
Start at 560. After 3 jumps back by 10, you land on ?.
Start at the start number. Count back by the count-by number for each jump.
Count back by 10s from 560: 550, 540, 530 → 530
Number reached: 530
Check
Put the numbers back in. Both sides should match.
560 − 3 jumps of 10 = 530 ✓
Topic check
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