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Florida Grade 1 Math · Number Sense and Operations

MA.1.NSO.2.2: Adding and Subtracting Within 20

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

Download Free Worksheet (PDF)See worked examples

What Is Benchmark MA.1.NSO.2.2?

Children add two numbers with sums up to 20 and subtract using related facts. The goal is a method your child understands and can use correctly every time.

Helpful strategies: making a ten (9 + 6 = 9 + 1 + 5), doubles (6 + 6), and thinking of subtraction as a missing addend. Problems include adding to, putting together, taking from, and comparing.

Official benchmarkAdd two whole numbers with sums from 0 to 20, and subtract using related facts with procedural reliability.

How it is tested: Grade 1 students take FAST Star Math, Florida's math test for Kindergarten through Grade 2.

Worked Examples

Worked Example 1

Make a Ten

9 + 6
  1. 1Break 6 into 1 and 5.
  2. 29 + 1 = 10
  3. 310 + 5 = 15
Answer: 15

Worked Example 2

Think Addition

15 − 8
  1. 1Think: 8 plus what makes 15?
  2. 28 + 7 = 15, so 15 − 8 = 7
Answer: 7

Common Mistakes to Watch For

Losing track when crossing 10

Wrong:8 + 5 = 12

Make a ten: 8 + 2 = 10, and 3 more is 13. So 8 + 5 = 13.

Subtracting the smaller digit from the larger one

Wrong:14 − 6 = 12 (because 6 − 4 = 2)

Think addition: 6 + 8 = 14, so 14 − 6 = 8.

Helpful Math Tip

Use a ten-frame (an egg carton with 2 cups cut off works) to show making a ten. Ask your child to explain the strategy they used.

Related Grade 1 Skills

MA.1.NSO.2.1

Addition Facts to 10

MA.1.AR.1.1

Adding Three Numbers

MA.1.AR.1.2

Addition and Subtraction Story Problems

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Independent 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.