Hundredths Grid 🟧

One whole square, cut into 100. Every column is a tenth and every small square a hundredth. Shade the decimal you are asked for, then check.

Case 1 of 10 Streak 0 Best 0

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Tap a square to shade up to it (columns fill top to bottom), or use the buttons.

0.00

How to play Hundredths Grid

  1. Read the decimal to shade: it may be written as 0.45, as "4 tenths and 5 hundredths" or in words.
  2. Tap a square to shade the grid up to that square. Columns fill from top to bottom, so a full column is one tenth.
  3. Fine-tune with + 1 tenth, + 1 hundredth and the minus buttons. The readout shows your decimal as you go.
  4. Press Check. If it is not right, the correct shading appears with the reason.
  5. Ten cases, from 0.3 to one whole.

Tenths and hundredths at a glance

A tenth is one of ten equal parts of a whole; a hundredth is one of a hundred. On the grid, 1 tenth = 10 hundredths, so 0.4 and 0.40 shade exactly the same area. Seeing that 0.5 covers half the grid while 0.05 covers five tiny squares is what stops the common mistake of thinking more digits means a bigger number.

For grown-ups

The grid makes the size of a decimal visible: 0.5 is five whole columns, while 0.05 is five small squares. Cases mix three ways of naming the same number (0.39, "3 tenths and 9 hundredths", "thirty-nine hundredths") and include the classic traps: 0.05 versus 0.5, and 0.80 being equal to 0.8. Ask your child to say each decimal aloud as tenths and hundredths before checking. Supports AC9M4N01 in the Australian Curriculum v9.