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Grade 1 · Math · Unit 1 of 10

Numbers to 20

Count, compare and build numbers

What your child practises

Counting, ordering and comparing numbers to 20, and seeing teen numbers as 1 ten and some ones.

Nunavut Curriculum approved guide: Alberta Mathematics K–9 (2007), Number · counting, representing and comparing numbers to 20, and one more and one less

How we explain it

Children can open this short lesson before they practise.

  1. Numbers 11 to 19 are 1 ten and some ones.
  2. Count on from 10: 11, 12, 13.
  3. The bigger number comes later when you count.

Example: How many tens and ones are in 17? 17 is 1 ten and 7 ones. 10 + 7 = 17. Answer: 1 ten and 7 ones

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which number is bigger?

    • 5
    • 17

  2. Question 2

    Build the number 20.

    Build it with tens rods and ones cubes.

  3. Question 3

    What number goes where the ? is?

    012345678910111213141516181920?
    • 20
    • 17
    • 13

  4. Question 4

    What number do the blocks show?

    • 19
    • 9
    • 13

  5. Question 5

    Tap the numbers from smallest to biggest.

    • 12
    • 15
    • 0
    • 13

  6. Question 6

    How many 🦋?

    • 11
    • 14
    • 13

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