When you bundle you always group 10 ones into one ten.
That way you find out the name of the number.
Example: You have 3 tens and 15 ones.
Ten ones become 1 ten. Then 5 ones are left over.
Now there are 4 tens and 5 ones, so 45.
Example
3 tens and 15 ones =45
2 tens and 16 ones =36
5 tens and 12 ones =62
4 tens and 18 ones =58
For parents
What does this exercise practice?
Bundle more than 9 ones into tens and name the number correctly.
Common pitfalls
Children often forget that a new ten is added and only copy the ones. Count the tens again after bundling.
How to practice at home
Use matchsticks to build bundles of ten and single sticks. Bundle together and name the number.
Related: Split a number into tens and ones, Digit Swap