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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.

Maine Learning Results 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 Maine

In the Maine Learning Results, 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: Maine 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?

    − 787 = 60

    answer box

  2. Question 2

    What number goes in the box?

    7 × = 35

    answer box

  3. Question 3

    What number makes both sides equal?

    7 × 9 = + 18

    answer box

  4. Question 4

    Which equation matches the story?

    Noah had some marbles.

    Noah got 112 more.

    Now Noah has 296 marbles.

    • ☐ − 112 = 296
    • ☐ + 112 = 296
    • 112 − ☐ = 296
    • 296 + 112 = ☐

  5. Question 5

    Some grapes were shared equally by 4 friends. Each friend got 8 grapes. How many grapes were there?

    🍇

    answer box

  6. Question 6

    What number goes in the box?

    278 + = 760

    answer box

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