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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.

Alaska content standards learning standard: 4.OA.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 Alaska

In the Alaska content 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: Alaska Department of Education and Early Development

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?

    5 × = 45

    answer box

  2. Question 2

    What number goes in the box?

    591 + = 894

    answer box

  3. Question 3

    What number goes in the box?

    751 − = 683

    • 67
    • 78
    • 68
    • 1434

  4. Question 4

    Zoe puts the same number of stamps on each of 4 pages. There are 28 stamps in all. How many stamps are on each page?

    📮

    answer box

  5. Question 5

    What number goes in the box?

    90 ÷ = 10

    • 9
    • 8
    • 11
    • 10

  6. Question 6

    What number makes both sides equal?

    5 × 6 = + 4

    answer box

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