SME
Grade 1 Math · Problem type
Find 1 less and 10 less
Use this for “What is 1 less? What is 10 less?” on the 120 chart.
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Number 57 (shaded).
One less: 56 (in a box).
Ten less: 47 (in a box).
This is an example. Type the numbers from your problem to start.
Number
example
One less
answer
Ten less
answer
Number sentences
57 − 1 = 56
57 − 10 = 47
Good to know
•
One less is the number just before.
•
Ten less is one row up on the chart. The ones digit stays the same.
Step-by-step
WE KNOW
Number: 57
FIND
one less, ten less
Step 1 · Find one less
57 − 1 = ?
Say the number just before. It is the box before.
One less: 56
Step 2 · Find ten less
57 − 10 = ?
Go one row up on the chart. The tens digit goes down by 1.
Tens: 5 → 4, ones stay 7
Ten less: 47
Check
Put the numbers back in. Both sides should match.
57 − 1 = 56 ✓
57 − 10 = 47 ✓
Topic check
See what you know: 5 questions on this topic
New questions each time. Pass to mark it complete.