Once they know their combinations to make TEN they can use that knowledge when adding numbers that make MORE THAN TEN.
I always use this when working on fluency within 20. We work on learning ten facts, doubles, near doubles, etc.
This is one of the hardest strategies, but most beneficial. It helps so much with more difficult mental math.
Kids will work on problems such as:
9 + 4 = ___
7 + 4 = ___
9 + 7 = ___
8 + 5 = ___
These answers will go up over ten. Kids need to MAKE A TEN first then add the leftovers.
For example 8+5....Move 2 counters up (8+2=10) and there will be 3 left on bottom.
They see 10+3 on their board and know it is 13.
We do many problems with ten frames. And physically move counters to make a ten to help us get our answers. For this activity, they should make each problem on a double ten frame and then write their answers. On the bottom they need to explain how they figured out 2 of the problems.