Decimal Operations Interactive Review Studio

Learn, practice, and play with adding, subtracting, multiplying, and dividing decimals.

Built for clarity: vertical worked examples, interactive step reveals, optional click-to-open hints, mixed practice, and two polished game tabs.

ESOL-friendly supports: simplified directions, sentence frames, math vocabulary, visual cues, and guided scaffolds that only appear when needed.

Interactive learn tab Hidden hints on click Vertical worked examples 2 game tabs Teacher-ready polish

How to use this review

  • Start on Tab 1 and click through the steps.
  • Use Show Hint only when needed.
  • Work longer problems on paper.
  • Finish with the two game tabs.

Progress

0Correct
0Checked
0Game Stars
0Boss Hits

Student Tools

Decimal Reminders

Add / Subtract: line up the decimal points.
Multiply: multiply first, then count decimal places.
Divide: make the divisor a whole number first.

Tab 1 — Learn With Interactive Step Reveals

Click through one clear step at a time. Use the visual hints only if you want extra help.
ESOL-friendly
Sentence Frames
  • I line up the decimal points because I am adding or subtracting.
  • I count the total number of decimal places because I am multiplying.
  • I move the decimal in the divisor to make a whole number because I am dividing.
  • My answer is reasonable because it is close to __________.

Decimal Point

The dot that separates whole numbers and parts of a whole.

Place Value

The value of a digit based on its position: ones, tenths, hundredths, thousandths.

Product

The answer to a multiplication problem.

Quotient

The answer to a division problem.

Decimal Vocabulary Chart

Word Simple Meaning Helpful Note
align put in a straight line For add/subtract, line up decimal points.
estimate find a close answer Round to check if your exact answer makes sense.
decimal places digits to the right of the decimal point Used a lot when multiplying decimals.
divisor the number you divide by Make the divisor a whole number first.

Add Decimals

Add

Problem: 12.45 + 3.8

12.45
+ 3.80
16.25
Step 1: Line up the decimal points.
Step 2: Write 3.8 as 3.80 so both numbers have the same number of decimal places.
Step 3: Add from right to left.
Step 4: Bring the decimal point straight down into the answer.
Visual guide:
  • Look for the decimal point first.
  • Put the decimal points in one vertical line.
  • Add zeros if one number has fewer digits.
Estimate: 12 + 4 is about 16, so 16.25 makes sense.

Subtract Decimals

Subtract

Problem: 9.2 − 4.67

9.20
- 4.67
4.53
Step 1: Line up the decimal points.
Step 2: Write 9.2 as 9.20.
Step 3: Subtract carefully from right to left.
Step 4: Bring the decimal point straight down.
Visual guide:
  • If one number is shorter, add a zero at the end.
  • Subtract in columns.
  • Keep the decimal in the same line.
Estimate: 9.2 is a little more than 9 and 4.67 is a little less than 5, so the answer should be a little more than 4.

Multiply Decimals

Multiply

Problem: 2.4 × 1.3

  24
× 13
 72
240
 312
3.12
Step 1: Ignore the decimal points at first.
Step 2: Multiply 24 × 13 = 312.
Step 3: Count the decimal places in the factors: 1 place in 2.4 and 1 place in 1.3.
Step 4: Put the decimal in the product so there are 2 decimal places total: 3.12.
Visual guide:
  • Multiply like whole numbers first.
  • Then count all decimal places in both factors.
  • Move the decimal into the product.
Estimate: 2.4 × 1.3 is a little more than 2.4, so 3.12 is reasonable.

Divide Decimals

Divide

Problem: 8.64 ÷ 0.3

8.64 ÷ 0.3
86.4 ÷ 3
28.8
Step 1: Make the divisor a whole number.
Step 2: Move the decimal in 0.3 one place right to make 3.
Step 3: Move the decimal in 8.64 one place right too, so it becomes 86.4.
Step 4: Divide 86.4 by 3 to get 28.8.
Visual guide:
  • Only move decimals to make the divisor a whole number.
  • Move the decimal in both numbers the same number of places.
  • Then divide as usual.
Estimate: Dividing by 0.3 makes the answer bigger than 8.64.

Tab 2 — Guided Practice

The first problems have built-in spaces for students to work through the steps.
How to work this tab
  • Fill in each blank box.
  • Then click Check.
  • If you are stuck, click Show Hint.
Guided Add

1) 7.35 + 2.4

Write 2.4 as so the decimal places match.

Then add: 7.35 + 2.40 =
7.35
+ 2.40
?
Start by making both numbers end in the same place value.
Guided Subtract

2) 15.6 − 8.27

Write 15.6 as so the decimal places match.

Then subtract: 15.60 − 8.27 =
Guided Multiply

3) 4.2 × 0.6

Ignore the decimal points first: 42 × 6 =

Total decimal places in 4.2 and 0.6 =

Final answer =
Guide: Multiply like whole numbers first. Then count decimal places: 1 place + 1 place = 2 places total.
Guided Divide

4) 5.52 ÷ 0.4

Make the divisor a whole number: 0.4 becomes

Move the decimal in 5.52 the same way: 5.52 becomes

Then divide: ÷ 4 =
Guide: Move both decimals one place right. Then divide 55.2 by 4.

Tab 3 — Independent Practice

Work the problems on paper. Type only the final answer here. Each problem has an optional click-to-open hint.
Add / Subtract

1) 6.38 + 1.9

Write 1.9 as 1.90.
Add / Subtract

2) 14.05 − 3.8

Line up decimals: 14.05 − 3.80.
Multiply

3) 3.7 × 2.5

Think 37 × 25 first, then place 2 decimal places in the product.
Multiply

4) 0.48 × 0.6

48 × 6 = 288. Then move the decimal 3 places.
Divide

5) 7.2 ÷ 0.9

Make 0.9 into 9. Then divide 72 by 9.
Divide

6) 12.96 ÷ 0.8

Shift both decimals once: 129.6 ÷ 8.
Mixed

7) (4.6 + 1.25) × 0.4

Do the parentheses first: 4.6 + 1.25 = 5.85, then multiply.
Mixed

8) 9.5 − 1.2 ÷ 0.3

Divide 1.2 by 0.3 first. Then subtract from 9.5.

Tab 4 — Mixed Review and Error Analysis

Sort steps, catch mistakes, and strengthen decimal reasoning.

Error Analysis

Problem: 3.4 × 0.7

A student says: 3.4 × 0.7 = 23.8

Quick Visual Reminder

Drag the Steps Into the Correct Order

Task: Put the steps for dividing 6.24 ÷ 0.6 in order.

Drop Zones
1.
2.
3.
4.
Draggable Steps
Divide 62.4 by 6.
Move the decimal in 0.6 one place right.
Write the quotient: 10.4.
Move the decimal in 6.24 one place right to get 62.4.

Quick Mixed Check

1) 0.75 + 0.08 = ?

2) 5.6 × 0.2 = ?

3) 4.5 ÷ 0.5 = ?

4) 8.1 − 3.47 = ?

Tab 5 — Game 1: Decimal Treasure Track

Answer correctly to move across the track and collect stars.

Treasure Track Scoreboard

0Spaces Moved
1Question
0Stars
0Streak
Bonus: Every 3-question streak earns an extra star.
Loading question...
Answer a question to earn stars.

Tab 6 — Ultimate Boss Battle: Defeat Mr. Neft

Each correct answer hits the boss. Clear every round to win the full challenge.

Ultimate Boss

MN
Mr. Neft's Decimal Challenge

Beat the challenge by answering decimal operation questions correctly. Wrong answers let Mr. Neft recover a little energy.

1Round
100Health
0Combo
0Wins
Loading boss round...
Correct answers deal 20 damage. A combo deals bonus damage.
Boss rule: Two correct answers in a row give a combo bonus.
This version is built as a polished single-file classroom interactive. Future upgrades can easily add audio read-aloud, teacher data tracking, printable companion pages, drag-and-drop mini-games, timed challenge mode, and more tab sets without rebuilding the structure.