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Numbers to 100

Counting, reading, writing, and understanding the place value of numbers up to 100.

Learn it step by step

A number up to 100 has tens and ones

Every two-digit number is made of tens and ones. means 5 tens and 3 ones, because .

0123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100+3
53 is 5 tens (50) and 3 more ones.

Counting on and counting back

To count on, say the numbers in order, one after another, going up. To count back, say them going down. Counting on from gives .

27+1
28+1
29+1
30
Counting on adds 1 each time.

Ten more or ten less

Adding 10 to a number changes only the tens digit; the ones digit stays the same. , and .

Numbers can be shown many ways

The same number can be written as digits (), in words (forty-seven), or as tens and ones (4 tens and 7 ones). All three mean the same amount.

Look and learn

What is 6 tens and 8 ones as a number?
  1. 6 tens is .
  2. Add the 8 ones: .
  3. The number is 68.
What number is 10 more than 56?
  1. Adding 10 changes only the tens digit.
  2. .
  3. The answer is 66.
Count on from 48: what are the next 3 numbers?
  1. Say the numbers in order after 48.
  2. .
  3. The next 3 numbers are 49, 50, 51.

Mind map

Mind map for Numbers to 100.

  • Place value
    • tens
    • ones
  • Counting
    • counting on
    • counting back
  • 10 more / 10 less
    • tens digit changes
Now try it →