Worked Example 1
Add Tens, Then Ones
38 + 45
- 1Add the tens of 45 first: 38 + 40 = 78
- 2Then add the ones: 78 + 5 = 83
Answer: 83
Florida Grade 2 Math · Number Sense and Operations
MA.2.NSO.2.3: Adding and Subtracting Within 100
What this Grade 2 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.2.NSO.2.3?
Students add two whole numbers with sums up to 100 and subtract numbers up to 100. The goal is procedural reliability: a method your child understands and can use correctly every time.
Common methods are adding tens and then ones, jumping on a number line, and breaking numbers apart by place value. Regrouping (trading 10 ones for a ten) comes up often.
Official benchmarkAdd two whole numbers with sums up to 100 with procedural reliability. Subtract a whole number from a whole number, each no larger than 100, with procedural reliability.
How it is tested: Grade 2 students take FAST Star Math, Florida's math test for Kindergarten through Grade 2.
Worked Examples
Worked Example 2
Subtract by Place Value
76 − 32
- 1Subtract the tens: 70 − 30 = 40
- 2Subtract the ones: 6 − 2 = 4
- 3Put them together: 40 + 4 = 44
Answer: 44
Common Mistakes to Watch For
Subtracting the smaller digit from the larger one
Wrong:52 − 27 = 35
You can't take 7 ones from 2 ones, so trade a ten: 52 is 4 tens and 12 ones. 12 − 7 = 5 and 40 − 20 = 20, so 52 − 27 = 25.
Forgetting the new ten when adding
Wrong:47 + 36 = 73
7 + 6 = 13 ones, which is 1 ten and 3 ones. Tens: 40 + 30 + 10 = 80. So 47 + 36 = 83.
Helpful Math Tip
Let your child pick the method that makes the most sense to them, then check the answer with a different method, such as adding to check a subtraction.
Related Grade 2 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.