Worked Example 1
Adding Decimals
3.45 + 2.8
- 1Write 2.8 as 2.80 so both numbers have hundredths.
- 2Line up the decimal points and add: 3.45 + 2.80 = 6.25
Answer: 6.25
Florida Grade 4 Math · Number Sense and Operations
MA.4.NSO.2.7: Adding and Subtracting Decimals
What this Grade 4 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.4.NSO.2.7?
Students explore adding and subtracting numbers with decimals to the hundredths, using place value models and connections to money.
The key is lining up the same place values: ones with ones, tenths with tenths, hundredths with hundredths. Adding a zero (2.8 = 2.80) can help.
Official benchmarkExplore the addition and subtraction of multi-digit numbers with decimals to the hundredths.
On the FAST test: part of the Grade 4 reporting category Number Sense and Operations with Fractions and Decimals, which is about 31–37% of the test.
Worked Examples
Worked Example 2
Making Change
$10.00 − $3.65
- 1Count up from $3.65: $0.35 gets to $4.00, then $6.00 gets to $10.00.
- 2$0.35 + $6.00 = $6.35
Answer: $6.35
Common Mistakes to Watch For
Lining up the last digits instead of the decimal points
Wrong:3.45 + 2.8 = 3.73
Line up the decimal points: 3.45 + 2.80 = 6.25.
Forgetting to regroup
Wrong:5.2 − 1.75 = 4.55
Write 5.2 as 5.20 and regroup: 5.20 − 1.75 = 3.45.
Helpful Math Tip
Use real coins and bills: adding $3.45 and $2.80 with money makes the place values obvious.
Related Grade 4 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.