World 1 · Counting & Fractions · 7 minTrade ten for one
Regrouping
Teaching this? Open projector mode
Ten blocks of one kind are worth exactly one block of the next size:
- 10 units = 1 rod
- 10 rods = 1 flat
- 10 flats = 1 cube
So you can trade 10 small blocks for 1 bigger block, and the number stays the same. You can also trade the other way: break 1 rod into 10 units.
Check yourself
4 rods and 15 units: what number is that?
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