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4th grade · Math · Unit 10 of 17

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.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 4.5(A) · multi-step problems with a letter for the unknown number

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 Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 10 of 17 in 4th grade Math, after Patterns & Tables and before Angles & Area.

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

    What number goes in the box?

    6 × = 36

    answer box

  2. Question 2

    What number goes in the box?

    ÷ 7 = 5

    • 28
    • 35
    • 12
    • 42

  3. Question 3

    Kenji puts the same number of stamps on each of 7 pages. There are 56 stamps in all. How many stamps are on each page?

    📮

    answer box

  4. Question 4

    What number goes in the box?

    276 + = 609

    answer box

  5. Question 5

    Which equation matches the story?

    Some boxes each hold 5 pencils.

    There are 15 pencils in all.

    How many boxes are there?

    • ☐ ÷ 5 = 15
    • 15 × 5 = ☐
    • ☐ × 5 = 15
    • ☐ + 5 = 15

  6. Question 6

    What number makes both sides equal?

    8 × 5 = + 15

    answer box

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