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4th grade · Math · Unit 3 of 17

Decimals

Tenths, hundredths, add and subtract

What your child practices

Tenths and hundredths as decimals, linking them to fractions, placing and comparing them on number lines, and adding and subtracting decimals by lining up the decimal points.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 4.2(F); 4.4(A) · comparing and ordering decimals to hundredths, and adding and subtracting them

How we explain it

Children can open this short lesson before they practice.

  1. Tenths: 0.1 is one of ten equal parts. Hundredths: 0.01.
  2. A decimal point separates wholes from parts.
  3. Line up the decimal points to add and subtract.

Example: What is 3.3 + 3.5? Line up the points. Tenths: 3 + 5 = 8. Ones: 3 + 3 = 6. Answer 6.8. Answer: 6.8

Decimals in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 3 of 17 in 4th grade Math, after Tenths & Decimals and before Add & Subtract.

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

    Each bar is 1 whole. What decimal shows the shaded part?

    answer box

  2. Question 2

    What decimal goes where the ? is?

    66.57?
    • 6.6
    • 6.4
    • 6.5
    • 6.8

  3. Question 3

    What is 3.69 − 2.42?

    3.69 − 2.42 = ?

    answer box

  4. Question 4

    Which sign goes in the box?

    2.33 2.1

    • <
    • =
    • >

  5. Question 5

    Put the decimals in order from least to greatest.

    • 0.19
    • 0.51
    • 0.81
    • 0.27

  6. Question 6

    Write 42 hundredths as a decimal.

    answer box

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