4th grade decimals
4th grade decimals (class 4): a quiz for kids, then every skill in order with lessons, a checklist and a 4-week plan for parents.
🧒 Kids: answer 10 grade 4 decimal questions. Tap Check ✓ after each one!
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What 4th grader learn about decimals
In grade 4 (class 4), children meet decimals for the first time as tenths and hundredths. They write fractions with denominators 10 and 100 as decimals, read decimals on a number line, use money, and compare two decimals to hundredths.
- 4.NF.C.5: write a tenths fraction as hundredths and add tenths and hundredths, such as 3/10 + 4/100 = 34/100.
- 4.NF.C.6: use decimal notation for fractions with denominators 10 and 100, and place decimals on a number line.
- 4.NF.C.7: compare two decimals to hundredths, and record the result with >, = or <.
- 4.MD.A.2: solve word problems with money and measurements, including decimals.
The big idea in grade 4
Grade 4 is the year decimals first appear, and they arrive through fractions. Children learn that 3/10 can be written 0.3 and 47/100 can be written 0.47 (4.NF.C.6). The decimal point is simply a new way to show tenths and hundredths.
The standards stop at hundredths, so money is the perfect model. A dime is a tenth of a dollar and a cent is a hundredth. Children who can read $3.45 as 3 dollars, 4 dimes and 5 cents already understand 3.45.
By the end of the year, children compare two decimals to hundredths (4.NF.C.7). They explain each answer with a picture or a number line. They also add tenths and hundredths by turning them into hundredths: 3/10 + 4/100 = 34/100 = 0.34.
4th grade decimal skills, in order
Work down the list. Each lesson explains the idea for parents with pictures and has a tool or quiz for your child.
By the end of grade 4, your child should be able to…
- Shade 0.7 on a tenths bar and 0.35 on a hundred grid.
- Write 6/10 and 6/100 as decimals.
- Read 4.08 aloud as “four and eight hundredths”.
- Put 0.4 and 0.75 on a number line from 0 to 1.
- Say which is bigger, 0.5 or 0.45, and explain why.
- Write $2.05 and explain what each digit is worth.
Unsure where your child is? The decimal levels page has a short test for every step from tenths to dividing decimals.
A 4-week plan for 4th grade decimals
| When | Focus |
|---|---|
| Week 1 | Tenths with bars, strips and money; writing 0.1 to 0.9 |
| Week 2 | Hundredths with a hundred grid and cents; place value |
| Week 3 | Reading and writing decimals; number lines |
| Week 4 | Comparing decimals, money problems and decimals to fractions |
Add 5 minutes a day with the decimal practice tool. Check answers with the decimal calculator, and use the place value chart whenever a picture helps.
More for grade 4
All 4th grade math · CBSE class 4 maths parent guide · 4th grade fractions · Decimals quiz for every grade · Decimals for kids
What to say to your child
A short script for teaching it the first time. Pause after each line and let your child do the next step.
- “A dime is what part of a dollar?” (A tenth.) “We can write that as 0.1.”
- “How many cents in a dollar?” (100.) “So one cent is 0.01.”
- “Show me $0.35 with coins.” (3 dimes and 5 cents.)
- “Shade 0.35 on the hundred grid.” (3 columns and 5 squares.)
- “Which is more, 0.4 or 0.35?” (0.4, because 40 hundredths beats 35.)
More worked examples
Example 1: fraction to decimal: 7/10
Seven tenths is 0.7: the 7 goes in the tenths place.
Example 2: hundredths: 9/100
Nine hundredths is 0.09. Hundredths need two places, so a zero holds the tenths.
Example 3: comparing: 0.6 or 0.58
Write 0.6 as 0.60. Then 60 hundredths is more than 58, so 0.6 > 0.58.
Practice questions (answers below)
Ask these out loud or write them down. Check each answer, and ask “how did you get that?” for one or two.
- Write 3/10 as a decimal
- Write 45/100 as a decimal
- Write 0.8 as a fraction
- Write 7 hundredths as a decimal
- Which is bigger, 0.7 or 0.65?
- 0.4 â—‹ 0.40
- Write $3 and 6 cents
- What is the 5 worth in 2.45?
- 3/10 + 4/100 as a decimal
- Stretch: 1.2 or 1.19?
Show the answers
- 0.3
- 0.45
- 8/10
- 0.07
- 0.7
- =
- $3.06
- 5 hundredths
- 0.34
- 1.2
Common mistakes
How to teach it at home
Five minutes a day
Short daily practice beats long weekend sessions.
Use money
Prices, change and pocket money make tenths and hundredths real.
Measure things
Heights in metres, weights in kilograms and race times are all decimals.
By grade
- Before: 3rd grade fractions (decimals start from fractions)
- After: 5th grade decimals
Not sure where to start?
The free 4th grade math check-up tests every grade 4 topic in 18–22 minutes. It shows which topics are solid and which lesson to start with.
Worksheets and practice
Tenths and hundredths worksheet: printable PDF with an answer key.
Last reviewed
Questions parents ask
What decimals should a 4th grader know?
Tenths and hundredths. They write fractions like 3/10 and 47/100 as decimals, read decimals and place them on a number line. They also compare decimals to hundredths and use money.
Do 4th graders add and subtract decimals?
Only in a simple way. Grade 4 adds tenths and hundredths as fractions and works with money. Column addition of decimals is a grade 5 skill.
Is there a 4th grade decimals quiz?
Yes. The quiz at the top of this page has 10 mixed grade 4 decimal questions. Each one is marked straight away, with a hint for every mistake. Play again for a fresh set, or try the decimals quiz for every grade.
What is class 4 decimals?
Class 4 in India and grade 4 in the US cover very similar decimal skills. This page lists them in order, starting with what are decimals, tenths, hundredths.
How much decimal practice does a 4th grader need?
About 10 minutes a day: 5 minutes on the current skill with the practice tool and 5 minutes of mixed review. Short daily practice works better than long weekly sessions.