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1st grade · Math · Unit 2 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.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 1.2(B); 1.2(E); 1.2(F); 1.2(G) · tens and ones, comparing and ordering numbers to 120, and the symbols >, < and =

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 Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 2 of 16 in 1st grade Math, after Numbers to 20 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: Texas Education Agency (TEA)

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

    How many tens make 30?

    • 7
    • 3
    • 9

  2. Question 2

    What number is shown?

    • 32
    • 42
    • 27

  3. Question 3

    Tap the numbers from smallest to biggest.

    • 48
    • 50
    • 49
    • 61

  4. Question 4

    What number is shown?

    • 53
    • 52
    • 46

  5. Question 5

    Build the number 73.

    Build it with tens rods and ones cubes.

  6. Question 6

    Which number is less: 70 or 25?

    • 70
    • 25

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