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Numbers · Grade 1

Ten More and Ten Less Worksheets

Adding or removing one ten changes the tens while the ones stay the same. Explain the change before relying on a digit rule.

6 problemsAnswer key includedFree printableA4 & US Letter
Generate & printSee the worked example

Change a ten, keep the ones

Start with 34: three tens and four ones. Ten more means adding one whole group of ten. Now there are four tens and four ones, so 34 + 10 = 44. The four loose ones have not changed.

10 less than 34 is 24.
10 more than 34 is 44.

Build 34 with three bundles of ten objects and four loose objects. Remove one bundle to show 24. Rebuild 34, then add one bundle to show 44.

Why counting every object is unnecessary

A complete bundle is already worth ten. Adding or removing a bundle changes the number of tens by one. Ask the child to name the tens and ones before and after the change. They can use objects first and then explain the change mentally.

If a child says 35 is ten more than 34: compare adding one loose object with adding one bundle of ten. The first makes 35; the second makes 44. Ask which action matches “ten more.”

Read more and less carefully

Ten more gives a greater number; ten less gives a smaller number. For 72, ten less is 62, not 82. Check that the answer changes in the requested direction and that the ones digit stays 2.

What happens near ten?

Ten less than 14 is 4: removing its only ten leaves four ones. Ten less than 10 is 0. Write 0 when nothing remains; do not leave the answer blank. An answer can have one digit even though every starting number on this sheet has two digits.

Explain and check

After finding that ten more than 57 is 67, take ten away from 67 to return to 57. For a drawing, use a long mark for each ten and a dot for each one, and say what each mark represents. An adult may write the child's spoken explanation.

About this practice

Each sheet contains three “ten more” and three “ten less” questions, alternating across six distinct prompts. Starting numbers range from 10 through 89, and answers range from 0 through 99. A set does not guarantee a zero answer or a starting number ending in zero.

The sheet practices changing exactly one ten. It does not cover adding arbitrary multiples of ten, crossing 100, or counting supplied pictures. The space below each answer is for a drawing or a brief explanation.

Make a practice set

Choose what to print. Selecting both shows the answer key on screen and prints the questions followed by the answers.

Print materials

After the practice

Ask what changed and what stayed the same. Reverse the change to check the starting number.

More about numbers · Grade 1 worksheets

Grade 1 selected skill connection: 1.NBT.C.5. See the Common Core grade guidance. This worksheet does not cover every requirement in the standard.