Introduction to decimals
Tenths and hundredths — what 0.5 and 1.25 mean. Decimal point, reading, comparing and rounding, plus adding, subtracting, multiplying and dividing decimals.
Available exercises
Round decimals
Round a decimal to ones, tenths or hundredths using the 0–4 / 5–9 rule.
Add and subtract decimals
Add and subtract decimals with tenths and hundredths. Line up the decimal points.
Multiply and divide decimals by 10, 100, 1000
Multiply or divide a decimal by 10, 100 or 1000 — shift the decimal point right or left.
Multiply a decimal by a whole number
Multiply a decimal (1–2 decimal places) by a single-digit whole number.
Divide a decimal by a whole number
Divide a decimal by a single-digit whole number — the answer is always clean (no remainder).