How it works
A flat is one hundred. A rod is ten. A cube is one.
Ten rods make a flat. Ten ones make a rod.
In a number, each digit says how many of its place: 6 hundreds, 0 tens and 8 ones is 608.
Worked examples
Rods only
- 20 rods: ? ? ?
- Ten rods make a flat, so group them in tens.
- Say how many hundreds, tens and ones are left.
- So the answer is 2, 0, 0.
Flats and cubes
- 6 flats, 8 cubes: ? ? ?
- Count the flats for the hundreds.
- A place with nothing is a zero, and it still needs to be written.
- So the answer is hundreds = 6, tens = 0, ones = 8.
More than ten rods
- 1 flat, 12 rods, 1 cube: ? ? ?
- Ten rods turn into a flat. Trade them.
- Then count the new hundreds, tens and ones.
- So the answer is hundreds = 2, tens = 2, ones = 1.
A taste of the worksheet
These are the first problems of set A. The printable sheet has many more, with an answer key.
- A flat is 100. What number do the blocks show? ___
- Count the flats and then the cubes. What number is it? ___