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
Decimal place value
Identify the digit in the tenths or hundredths place of a decimal.
Decimal on a number line
Read the decimal marked by a point on a 0..1 number line.
Compare decimals
Choose <, > or = to compare two decimals.
Round decimals
Round a decimal to ones, tenths or hundredths using the 0–4 / 5–9 rule.
Decimals and fractions
Match a decimal with its fraction (tenths or hundredths).
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).
Divide a decimal by a decimal
Divide one decimal by another. The trick: shift the decimal point the same number of places to the right in both numbers — that turns the divisor into a whole number and you divide as usual.