Worked Example 1
No Regrouping
48 − 5
- 1Subtract the ones: 8 − 5 = 3
- 2The 4 tens stay the same: 48 − 5 = 43
Answer: 43
Florida Grade 1 Math · Number Sense and Operations
MA.1.NSO.2.5: Subtracting a One-Digit Number
What this Grade 1 benchmark means, worked examples, common mistakes, and a free printable worksheet.
Created by a Florida mom · Published by Tropical Learning LLC
What Is Benchmark MA.1.NSO.2.5?
Children explore subtracting a one-digit number from a two-digit number, using a number line, objects, drawings, or equations.
They can count back, or count on: 37 − 6 is the same as asking, "What number added to 6 makes 37?" Sometimes a ten must be broken into 10 ones.
Official benchmarkExplore subtraction of a one-digit number from a two-digit number.
How it is tested: Grade 1 students take FAST Star Math, Florida's math test for Kindergarten through Grade 2.
Worked Examples
Worked Example 2
Back to a Ten, Then Back Again
32 − 5
- 1Break 5 into 2 and 3.
- 232 − 2 = 30
- 330 − 3 = 27
Answer: 27
Common Mistakes to Watch For
Subtracting the smaller digit from the larger one
Wrong:32 − 5 = 33
You can't take 5 ones from 2 ones, so go back to 30 first: 32 − 2 = 30, then 30 − 3 = 27.
Subtracting from the tens
Wrong:47 − 3 = 17
3 is 3 ones, so take it from the 7 ones: 47 − 3 = 44.
Helpful Math Tip
Use a number line or a 100 chart and count back by ones. For bigger jumps, jump back to the nearest ten first.
Related Grade 1 Skills
Make Florida Math Practice More Fun
Help your child build math confidence with original interactive questions aligned with Florida's B.E.S.T. Mathematics Standards.
Start Practicing FreeIndependent Educational Platform. FastChomp is published by Tropical Learning LLC and is not affiliated with, sponsored by, or endorsed by the Florida Department of Education. FAST and Star assessment names are referenced for informational purposes only. FastChomp practice questions are original educational materials, not official Florida FAST assessment questions.