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Grade 1 · Math · Unit 3 of 11

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.

Prince Edward Island Curriculum curriculum outcome: N4; N5 · counting, building, ordering and comparing numbers to 20 with ten frames

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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