Decimal Grid
A hundred grid for decimals: a column is a tenth, a square a hundredth and a strip inside a square a thousandth. The same number as a decimal, a fraction and a percentage, comparing two grids, adding, subtracting and multiplying.
Free, runs in the browser, no sign-in or installation.
- Subject
- Mathematics
- Area
- Numbers
- Level
- Primary school
What you can do
- Type a number or click a square: the grid is coloured, and the same number is shown as a decimal, a fraction and a percentage, e.g. 0.47 = 47/100 = 47%.
- Thousandths appear as strips in a square, and numbers greater than 1 as several grids; below, the number is split up, e.g. 4 tenths and 7 hundredths = 47 hundredths.
- Compare two grids side by side: 0.4 and 0.45, or 0.3 and 0.30, with an explanation in hundredths.
- Add and subtract by colouring: the second addend is another colour, and what you take away is crossed out; a sum greater than 1 carries on to a second grid.
- Multiply tenths with an area model (0.3 × 0.4 = 0.12), hide the calculation for a task and download the picture as a PNG.
More apps: Numbers
Number LineFractions, decimals, negative numbers, intervals and inequalities on a number line.
Decimal ZoomDecimals on a zooming number line: placing, comparing and rounding.
Hundred ChartMultiples, primes and the sieve of Eratosthenes on a chart of numbers to 100.
Factors and Prime FactorsFactor pairs from rectangles, factor trees and prime factorisation.
Place Value BlocksBase ten blocks for place value, regrouping, decimals and comparing numbers.
RodsColoured rods for numbers, measuring and fractions.