Decimals
Find tenths and hundredths on the number line, and see how decimals are written and read.
- UK: Year 3
- France: grade 4
- Germany: grade 6
- Iran: grade 4
- Afghanistan: grade 6
- Syria: grade 5
- Palestine: grade 4
- Ukraine: grade 5
- Russia: grade 5
Guide
If we split the space from 0 to 1 into 10 equal parts, each part is one tenth: 110. Three parts make 310.
We can also write 310 as 0.3. The dot in this number is the decimal point. Whole numbers go to the left of the point, and the first digit to its right shows tenths. We read 0.3 as "zero point three" or "three tenths", and 1.3 as "one point three". In Iran the decimal point is written as a slash (۰/۳) and in Afghanistan as a comma (۰,۳), which is why fractions in this academy are always stacked, one number above the other.
If we split each tenth into 10 equal parts again, each part is one hundredth: 1100, written 0.01. The second digit after the point shows hundredths.
Hundredths are tiny, so sometimes we zoom in: the top line shows the whole number line, and the coloured piece is the part that is magnified below.
Tap the line to place a point. You can drag a point, or tap it and move it with the arrow keys.