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1st grade · Math · Unit 9 of 14

Numbers to 100

Tens, ones and big numbers!

What your child practices

Reading and building numbers to 100 with tens and ones, comparing them, and seeing that two names can mean the same amount.

Minnesota K-12 Academic Standards benchmark: 1.3.5.4; 1.3.6.1 · tens and ones in numbers to 120, and comparing two-digit numbers

How we explain it

Children can open this short lesson before they practice.

  1. A 2-digit number has tens and ones.
  2. 10 tens make 100.
  3. Compare the tens first. More tens means bigger.

Example: Which is less: 39 or 42? Tens: 3 tens and 4 tens. 3 tens is less. So 39 is less. Answer: 39

Numbers to 100 in Minnesota

In the Minnesota K-12 Academic Standards, this is unit 9 of 14 in 1st grade Math, after Data & Graphs and before Count It Up.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Minnesota Department of Education (MDE)

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

    72 is 7 tens and how many ones?

    • 2
    • 7
    • 6

  2. Question 2

    What number is shown?

    • 42
    • 39
    • 44

  3. Question 3

    How many tens make 20?

    • 4
    • 2
    • 8

  4. Question 4

    Tap the numbers from smallest to biggest.

    • 27
    • 42
    • 73
    • 56

  5. Question 5

    Which number is less: 54 or 39?

    • 54
    • 39

  6. Question 6

    Is 24 equal to 2 tens and 4 ones?

    • No, not equal (≠)
    • Yes, equal (=)

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