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4th grade · Math · Unit 7 of 15

Equations

Find the mystery number

What your child practices

Solving one-step equations with a box or letter for the unknown, using all four operations, and matching equations to word problems.

Arizona Academic Standards learning standard: 4.OA.A.3 · solving multistep problems with a letter for the unknown

How we explain it

Children can open this short lesson before they practice.

  1. An equation says two things are equal.
  2. Use the opposite operation to find the missing number.
  3. Check by putting your answer back in.

Example: ☐ + 7 = 15. What is ☐? Opposite of adding 7 is subtracting 7. 15 − 7 = 8. Answer: 8

Equations in Arizona

In the Arizona Academic Standards, this is unit 7 of 15 in 4th grade Math, after Patterns & Tables and before Polygons & Perimeter.

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 number goes in the box?

    − 316 = 486

    answer box

  2. Question 2

    What number goes in the box?

    ÷ 5 = 3

    • 10
    • 20
    • 8
    • 15

  3. Question 3

    What number goes in the box?

    3 × = 27

    answer box

  4. Question 4

    Some grapes were shared equally by 3 friends. Each friend got 10 grapes. How many grapes were there?

    🍇

    answer box

  5. Question 5

    What number goes in the box?

    21 ÷ = 7

    • 3
    • 7
    • 2
    • 4

  6. Question 6

    What number makes both sides equal?

    4 × 10 = + 17

    answer box

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