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Grade 1 · Math · Unit 4 of 11

Guess and Group

Smart guesses, and counting in equal groups.

What your child practises

Practises estimating a quantity to 20 using something known, such as ten, and making numbers up to 30 from equal groups of 2, 5 or 10, with or without singles.

Prince Edward Island Curriculum curriculum outcome: N6; N7 · estimating quantities to 20 and making numbers from equal groups

How we explain it

Children can open this short lesson before they practise.

  1. An estimate is a good guess, not an exact count.
  2. Compare to a group you know, like 10.
  3. Pick the guess that is closest.

Example: About how many beans are in a jar that holds 20? A group of 10 is easy to see. The jar looks like 2 groups of 10. Answer: About 20

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 estimate is closer for 18 beans: 2 or 20?

    • 20
    • 2
    • 100

  2. Question 2

    5 groups of 2 is how many?

    • 12
    • 7
    • 10

  3. Question 3

    4 groups of 2 is how many?

    • 8
    • 6
    • 10

  4. Question 4

    There are 20 beans in a jar that is almost full. Which guess is closest?

    • 5
    • 20
    • 50

  5. Question 5

    2 groups of 5 is how many?

    • 25
    • 7
    • 10

  6. Question 6

    Which makes 12: 6 groups of 2 or 6 groups of 1?

    • 6 groups of 1
    • 6 groups of 2
    • 2 groups of 1

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