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2nd grade · Math · Unit 7 of 16

Numbers to 1000

Hundreds, tens and ones

What your child practices

Reading and building numbers up to 1000 with hundreds, tens and ones, counting forwards and backwards by 10s and 100s, even and odd numbers, estimating with 100s as benchmarks, and comparing with <, > and =.

Arizona Academic Standards learning standard: 2.NBT.A.1; 2.NBT.A.2; 2.NBT.A.3; 2.NBT.A.4 · counting, reading, writing and comparing numbers to 1000 with hundreds, tens and ones

How we explain it

Children can open this short lesson before they practice.

  1. A 3-digit number has hundreds, tens and ones.
  2. Count by 10s or 100s to move up quickly.
  3. Compare hundreds first, then tens, then ones.

Example: Count by 10s: 140, 150, 160, 170, ? Each step adds 10. 170 + 10 = 180. Answer: 180

Numbers to 1000 in Arizona

In the Arizona Academic Standards, this is unit 7 of 16 in 2nd grade Math, after Graphs and before Fractions of a Whole.

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: Arizona Department of Education

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 is 10 more than 209?

    • 214
    • 219
    • 223

  2. Question 2

    In 372, what is the 7 worth?

    372

    • 7
    • 700
    • 70

  3. Question 3

    Count by 10s: 410, 420, 430, 440, ?

    • 450
    • 446
    • 440

  4. Question 4

    Build the number 582.

    Build it with tens rods, hundreds flats and ones cubes.

  5. Question 5

    Is 685 closer to 600 or 700?

    • 700
    • 600

  6. Question 6

    Is 710 closer to 700 or 800?

    • 800
    • 700

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