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4th grade · Math · Unit 5 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.

New York State Learning Standards learning standard: NY-4.NF.6; NY-4.NF.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 New York

In the New York State Learning Standards, this is unit 5 of 17 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: New York State Education Department (NYSED)

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 decimal goes where the ? is?

    11.52?
    • 1.3
    • 1.1
    • 1.4
    • 1.2

  2. Question 2

    What is 1.52 + 4.4?

    1.52 + 4.4 = ?

    answer box

  3. Question 3

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

    answer box

  4. Question 4

    What is 7.28 − 4.55?

    7.28 − 4.55 = ?

    answer box

  5. Question 5

    In 7.38, what is the value of the digit 8?

    7.38

    • 8 tenths
    • 8 ones
    • 8 tens
    • 8 hundredths

  6. Question 6

    Write 37 hundredths as a decimal.

    answer box

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