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7th grade · Math · Unit 4 of 22

Decimal Operations

Add, subtract, multiply, divide decimals

What your child practices

All four operations with decimals, estimating to check answers, ordering decimals, and money problems such as unit prices.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 7.3(A); 7.3(B) · computing with decimals in multi-step problems

How we explain it

Children can open this short lesson before they practice.

  1. To add or subtract, line up the decimal points.
  2. Fill empty places with zeros so the numbers match.
  3. Then add or subtract like whole numbers.

Example: 3.45 + 2.8 = ? Write 2.8 as 2.80 and line up the points. 3.45 + 2.80 = 6.25. Answer: 6.25

Decimal Operations in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 4 of 22 in 7th grade Math, after Fractions and before Proportional Relationships.

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

    Put these decimals in order from least to greatest.

    • 0.615
    • 0.06
    • 0.61
    • 0.016
    • 0.601

  2. Question 2

    What is 3.2 ÷ 0.8?

    3.2 ÷ 0.8 = ?

    answer box

  3. Question 3

    Apples cost $3.70 per kilogram. How much do 4.3 kg of apples cost, in dollars?

    answer box

  4. Question 4

    What is 2.13 + 10.8?

    2.13 + 10.8 = ?

    answer box

  5. Question 5

    Use the order of operations: what is 5.7 + 2.4 × 2?

    5.7 + 2.4 × 2

    • 13.8
    • 10.5
    • 10.6
    • 16.2

  6. Question 6

    What is 9.4 × 0.4?

    9.4 × 0.4 = ?

    • 3.76
    • 37.6
    • 0.0376
    • 0.376

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