Counting tens and ones – up to 30

Key notes :

Tens and Ones :

✌Tens:Tens refer to the groupings of ten units. In the decimal system, each group of ten units is represented by a single digit in the tens place of a number.

🏀If a Tenframe is completely filled then it is considered as a ten

Ones :

🏀Ones refer to the individual units that make up numbers. They are represented by digits in the ones place of a number.

🎇 If a Tenframe is not filled then it is considered as ones with respect to the number of frames filled

Learn with an example

✈️Count the dots:

Then fill in the missing numbers:

______ tens +______ ones =19

  • Count the tens.
  • There is 1 ten.
  • Count the ones. These are the ones:
  • There are 9 ones.
  • Write the tens, then the ones:
  • 1 ten + 9 ones = 19

✈️Count the dots:

Then fill in the missing numbers:

______ tens +______ ones =1

  • Count the tens.
  • There are 0 tens.
  • Count the ones.
  • There is 1 one.
  • Write the tens, then the ones:
  • 0 tens + 1 one = 1

✈️Count the dots:

Then fill in the missing numbers:

______ tens +______ ones =20

  • Count the tens. These are the tens:
  • There are 2 tens.
  • Count the ones.
  • There are 0 ones.
  • Write the tens, then the ones:
  • 2 tens + 0 ones = 20

Let’s practice!