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Florida Grade 1 Math · Number Sense and Operations

MA.1.NSO.2.3: One More, One Less, Ten More, Ten Less

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.2.3?

Children find the number that is one more, one less, ten more, or ten less than a two-digit number.

One more or one less changes the ones. Ten more or ten less changes the tens, and the ones stay the same. For example, ten more than 23 is 33.

Official benchmarkIdentify the number that is one more, one less, ten more and ten less than a given 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 1

All Four

What is one more, one less, ten more, and ten less than 23?
  1. 1One more: 24. One less: 22.
  2. 2Ten more: the tens go from 2 to 3, so 33.
  3. 3Ten less: the tens go from 2 to 1, so 13.
Answer: 24, 22, 33, 13

Worked Example 2

Crossing a Ten

What is one less than 40?
  1. 1Count back one from 40.
  2. 2The number before 40 is 39.
Answer: 39

Common Mistakes to Watch For

Changing the ones for ten more

Wrong:Ten more than 23 is 24.

Ten more changes the tens digit: 23 → 33.

Mixing up the tens when crossing a ten

Wrong:One less than 40 is 49.

One less than 40 is 39. The number just before 40 is 39.

Helpful Math Tip

Use a 100 chart: one more is one box to the right, and ten more is one box straight down.

Related Grade 1 Skills

MA.1.NSO.1.1

Counting to 120 and Skip Counting

MA.1.NSO.2.4

Adding a Two-Digit and a One-Digit 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.