Skill: decimal-operations
Decimal Operations Practice
An endless supply of never-repeating decimal problems with instant feedback. Line up the points for adding and subtracting, count decimal places when multiplying, slide the point when dividing — one problem at a time.
1 Practice
Type your answer and press Check answer (or Enter). A wrong answer earns a hint first; a second miss walks you through the full solution.
How to enter answers
- Decimal: type a decimal like
6.05. Dollar signs and commas are fine. Any equivalent form counts — 6.050 is the same as 6.05. - Trailing zeros don’t matter — 6.050 counts the same as 6.05.
2 What you’ll practice
Every problem is generated fresh from 10 templates — a problem never repeats until its whole pool is used up.
Add & subtract
Line up the decimal points and pad with zeros — tenths with tenths.
Multiply
Multiply as whole numbers, then count total decimal places.
Divide & money words
Slide the point to make the divisor whole; totals and change with dollars.
3 Watch out for these
The three mistakes students make most often with decimal operations.
Wrong: 4.25 + 1.8 = 4.43. Right: 4.25 + 1.80 = 6.05. The point is the anchor — pad with zeros.
Wrong: 2.4 × 0.35 = 8.4. Right: 0.84 (1 + 2 = 3 places). Estimate first: 2 × 0.4 ≈ 0.8.
Wrong: 7.5 ÷ 0.25 = 0.3. Right: slide both points → 750 ÷ 25 = 30.