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Can you use the interactivity to help you? You can choose the correct length rods from the interactivity by matching their colours.
Perhaps you could line up white rods alongside the coloured rods?
You could also use the grid lines to help.
Rod Ratios
Age 7 to 11
Challenge Level 
Can you use the interactivity to help you? You can choose the correct length rods from the interactivity by matching their colours.
Perhaps you could line up white rods alongside the coloured rods?
You could also use the grid lines to help.
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