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Grade 1 · Math · Unit 10 of 10

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.

Nunavut Curriculum approved guide: Alberta Mathematics K–9 (2007), Number · estimating quantities to 20 with referents, and numbers up to 30 as equal groups with and without singles

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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