A hundred is 10 tens or 100 ones. When we count to 1000 we use three places: ones, tens, and hundreds. For example, 243 means 2×100+4×10+3. Each digit tells how many hundreds, tens, and ones are in the number.
10 ones = 1 ten
10 tens = 1 hundred
Places: hundreds, tens, ones
536=5×100+3×10+6
Look at the number 243
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