Make a Ten to Add
Make a Ten to Add is a Grade 3 math skill from Eureka Math providing a mental addition strategy using multiples of 10. To add two numbers, decompose one addend to give the other what it needs to reach the next multiple of 10 (make a ten). Then add the remaining part. For example, 8 + 7: give 2 to the 8 to make 10, leaving 5. Then 10 + 5 = 15. This strategy reduces addition to simpler steps using round numbers and builds number sense for mental math that extends to larger numbers in later grades.
Key Concepts
To add two numbers using the 'make a ten' strategy, decompose one addend to give the other addend what it needs to become a multiple of 10. Then, add the new multiple of 10 to the remaining part of the decomposed number.
Common Questions
What is the 'make a ten' addition strategy?
Decompose one addend to give the other what it needs to reach the next multiple of 10. Then add the new multiple of 10 and the remaining part of the decomposed addend.
How do you use 'make a ten' to add 7 + 6?
7 needs 3 to reach 10. Take 3 from 6, leaving 3. Now: 7 + 3 = 10, then 10 + 3 = 13. So 7 + 6 = 13.
Why does making a ten simplify addition?
Adding to a multiple of 10 is easy since you just count on from a round number. Decomposing an addend to create that round number reduces the problem to two simpler steps.
How does 'make a ten' extend to larger numbers?
The same principle applies: 38 + 7 = 38 + 2 + 5 = 40 + 5 = 45. Give the first addend what it needs to reach the next ten, then add the remainder.
In which textbook is Make a Ten to Add taught?
This skill is taught in Eureka Math, Grade 3.