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1st grade · Math · Unit 10 of 16

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.

Alabama Course of Study content standard: 1.10; 1.11; 1.12 · counting to 120, tens and ones, 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 Alabama

In the Alabama Course of Study, this is unit 10 of 16 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: Alabama State Department of Education (ALSDE)

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

    What number is shown?

    • 53
    • 59
    • 58

  2. Question 2

    What number is shown?

    • 66
    • 61
    • 58

  3. Question 3

    Tap the numbers from smallest to biggest.

    • 45
    • 31
    • 62
    • 32

  4. Question 4

    Build the number 36.

    Build it with tens rods and ones cubes.

  5. Question 5

    How many tens make 70?

    • 7
    • 1
    • 4

  6. Question 6

    Which number is less: 46 or 59?

    • 46
    • 59

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