Build a Number with Tens and Ones

Supplied materials

• Paper and a pencil, or say your answers aloud.

Learn the idea

Ten single marks can be grouped into one ten. Draw a long box around ten dots to show the group. The group still contains ten dots; it is a quicker way to count them.

In a two-digit whole number, the left digit tells how many tens and the right digit tells how many ones. The number 14 has one ten and four ones: 10 + 4. Read the places, rather than adding the two digits.

1. Draw ten dots and put a box around all ten.
2. Draw four more dots outside the box to make 14.
3. For the check, draw a boxed group of ten and six separate dots.
4. Count by saying ten, then eleven through sixteen.

Check your reasoning

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Take it further

Draw 26 using two boxed groups of ten and six ones. Check 10 + 10 + 6 = 26, and explain what changed from 16.

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