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Florida Grade 2 Math · Number Sense and Operations

MA.2.NSO.2.1: Addition and Subtraction Facts to 20

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

Download Free Worksheet (PDF)See worked examples

What Is Benchmark MA.2.NSO.2.1?

By the end of Grade 2, students should know addition facts with sums up to 20, and the related subtraction facts, quickly and without counting on their fingers.

Strategies help them get there: making a ten (8 + 5 = 8 + 2 + 3), doubles and near doubles (6 + 7 is one more than 6 + 6), and using an addition fact to solve subtraction.

Official benchmarkRecall addition facts with sums to 20 and related subtraction facts with automaticity.

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

Worked Examples

Worked Example 1

Make a Ten

8 + 6
  1. 1Break 6 into 2 and 4.
  2. 28 + 2 = 10
  3. 310 + 4 = 14
Answer: 14

Worked Example 2

Think Addition to Subtract

15 − 7
  1. 1Ask: 7 plus what makes 15?
  2. 27 + 8 = 15
  3. 3So 15 − 7 = 8
Answer: 8

Common Mistakes to Watch For

Counting the starting number again when counting on

Wrong:9 + 4 = 12 (counting 9, 10, 11, 12)

Start counting after 9: 10, 11, 12, 13. So 9 + 4 = 13.

Counting back one at a time for every subtraction fact

Wrong:17 − 9: counting back 9 times and losing track

Use the related addition fact: 9 + 8 = 17, so 17 − 9 = 8.

Helpful Math Tip

Practice a few facts each day for a couple of minutes, mixing addition with the matching subtraction (7 + 6 = 13, 13 − 6 = 7). Short, regular practice builds speed better than one long session.

Related Grade 2 Skills

MA.2.NSO.2.3

Adding and Subtracting Within 100

MA.2.AR.2.2

Finding the Unknown Number

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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.