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4th grade · Math · Unit 5 of 15

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.

Maine Learning Results learning standard: 4.NF.C.6; 4.NF.C.7 · decimal notation for tenths and hundredths, and comparing decimals

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 Maine

In the Maine Learning Results, this is unit 5 of 15 in 4th grade Math, after Fractions and before Patterns & Tables.

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

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

    answer box

  2. Question 2

    What decimal goes where the ? is?

    88.59?
    • 8.4
    • 8.5
    • 8.7
    • 8.6

  3. Question 3

    In 2.83, what is the value of the digit 3?

    2.83

    • 3 tens
    • 3 ones
    • 3 hundredths
    • 3 tenths

  4. Question 4

    Which sign goes in the box?

    2.4 2.92

    • <
    • =
    • >

  5. Question 5

    Put the decimals in order from least to greatest.

    • 0.99
    • 0.65
    • 0.01
    • 0.38

  6. Question 6

    Write this fraction as a decimal.

    12/100

    answer box

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