How to Teach Decimals to Your 4th Grader

By the Practice Buds team · October 28, 2026

Short answer

Teach decimals as ordinary numbers cut into smaller equal parts. Start with a grid of 100 squares, then move to money, and only then to the written rules. Short, regular practice with printable introduction to decimals worksheets helps your child see that 0.3 and 0.30 are the same amount.

Why kids find this hard

Up to now, a longer number has always meant a bigger number. 125 beats 98 because it has more digits. Decimals break that habit. Your child sees 0.25 and 0.5 and thinks 25 must be larger than 5.

The second trap is the dot. Children read it as a separator between two whole numbers, so 3.45 becomes "three and forty-five" instead of "three and forty-five hundredths." The place value after the dot works the same way as before, but each place is a tenth of the one on its left.

Decimals are really fractions with a tidy notation. If tenths and hundredths are new to your child, our guide on how to teach place value covers the whole-number side that decimals build on.

How to teach it

Plan for 10 minutes a day. You need graph paper or a printed 10 by 10 grid, two colored pencils, and a few coins.

  1. Draw a 10 by 10 grid and call the whole grid "one." Ask how many squares are in it. There are 100.
  2. Shade one column of 10 squares. That is one tenth, and we write it as 0.1. Say it aloud: "one tenth."
  3. Shade one single square. That is one hundredth, written 0.01. Show that 10 hundredths fill one tenth: 10 × 0.01 = 0.1.
  4. Shade 3 columns and 4 extra squares. Count 34 squares out of 100 and write 0.34. Read it as "thirty-four hundredths."
  5. Move to money. A dime is one tenth of a dollar and a penny is one hundredth. Lay out 3 dimes and 4 pennies and write 34 cents as 0.34 of a dollar.
  6. Name the places out loud: ones, a dot, tenths, hundredths. Have your child point to each digit as they say its place.
  7. Compare two decimals on the grid before comparing them as numbers. Shade 0.4 and 0.35 and see which covers more.
  8. Finish by writing three decimals from a picture, then drawing three from a number.

Worked example

Which is larger, 0.4 or 0.35?

Step 1: Shade 0.4 on a grid. That is 4 whole columns, or 40 squares, because 4 × 10 = 40.

Step 2: Shade 0.35 on a second grid. That is 3 columns and 5 squares, or 35 squares, because 3 × 10 + 5 = 35.

Step 3: Compare the squares. 40 is more than 35, so 0.4 is larger.

Step 4: Check with place value. Write 0.4 as 0.40. Now both numbers have hundredths: 40 hundredths against 35 hundredths. So 0.4 = 0.40, and 0.40 is greater than 0.35.

Step 5: Say the rule in your child's own words: "Add zeros on the end until both numbers have the same places, then compare like whole numbers."

A second quick one: 7 tenths and 2 hundredths. Put 7 in the tenths place and 2 in the hundredths place to get 0.72. Check it by adding the parts: 0.7 + 0.02 = 0.72.

Common mistakes

Reading the dot as a divider. Your child says "three point forty-five" and thinks of 3 and 45 as separate numbers. Spot it when they call 3.45 bigger than 3.5. Fix it by always reading digits after the dot one at a time ("three point four five") and by drawing the grid.

Thinking longer means larger. Your child picks 0.25 over 0.5 because 25 is bigger than 5. Spot it when the answer follows the number of digits. Fix it with the grid: shade both and look. Then rewrite 0.5 as 0.50.

Dropping the zero in the tenths place. Your child writes 0.07 as 0.7. Spot it when hundredths come out as tenths. Fix it by showing 7 single squares next to 7 full columns on the grid. The two pictures look nothing alike.

Mixing up the names. Tenths and tens sound alike, and so do hundredths and hundreds. Spot it when your child writes 0.1 as "one ten." Fix it by tying the "th" ending to the dot: places on the right end in "ths."

Practice ladder

First (4th grade, weeks 1 to 2): Read and write tenths from a grid and a number line, such as 0.3 and 0.8. Keep hundredths out of it until tenths feel easy.

Next (4th grade, weeks 3 to 4): Hundredths on the 10 by 10 grid, then connect them to dollars and cents with decimals and money.

Then (4th grade, weeks 5 to 6): Name each digit's value, and write numbers in expanded form. Decimal place value is the next skill to practice here.

Later (late 4th and 5th grade): Compare and order decimals, then round them. Comparing decimals comes before any adding or subtracting. The full decimals topic lists every skill in teaching order.

FAQ

When do kids start learning decimals? Tenths and hundredths usually arrive in 4th grade, as the partner of fractions with denominators of 10 and 100. Some children meet them earlier through money.

Should we learn fractions first? Basic fractions help, especially the idea of equal parts. You do not need to master fraction arithmetic first.

Is money a good way in? Yes. Most children already know that a dime is a tenth of a dollar. Just be aware that money always shows two places, so it can hide the tenths-only decimals like 0.4.

How many problems per day? Five to eight, with drawings. A few every day works better than a long weekend session.

Practice at home

Decimals stick when your child can see them, shade them and say them out loud. Printing needs a free account.

Start with the introduction to decimals worksheets, then move across the decimals topic as your child gets comfortable.