Ten more or ten less than a number changes only the tens digit: 10 more than 46 is 56, and 10 less than 46 is 36. Children who see that do not have to count by ones, and they are using the structure of the number system, which is the point of this grade 1 skill. On this worksheet each line is a short sentence with a gap, such as 10 more than 46 is ____ or 10 less than 81 is ____, and your child writes the number.
Support sheets stay between 10 and 70, and standard and challenge sheets use the full range from 10 to 100. Say the number, then say the number with one more ten.
What your child will learn
Find 10 more than a number
Find 10 less than a number
See that only the tens digit changes
Count by tens from any number
Common Core standard: 1.NBT.C.5
Worked example
10 more than 46 is ____. The tens digit goes up by 1: 4 tens becomes 5 tens. The ones stay at 6. Write 56.
Common mistake
Changing the ones digit, so writing 47 for 10 more than 46.
Helpful hint
Only the tens digit changes. The ones digit stays the same.