Instead of students rotely memorizing facts, we are working very diligently to build number sense. The more students talk about numbers and understand how they can be put together and taken apart, the better number sense they will develop. As they become more automatic with their facts, they will be able to use facts they know to solve other problems. Having students explain their thinking using math vocabulary is crucial as well. For example, when solving 7+8=15 students may show their work like this:
7 is 5 and 2. I know 8 and 2 is 10. So 10 and 5 is 15.
5+2=7 so 2+5=7 so 7-5=2 and 7-2=5
We've spent a lot of time practicing double facts, because once those are mastered, we can apply them to near doubles. Doubles +/-1 and Doubles +/-2 are facts you can master once you know doubles.
And finally, if you know your single doubles facts facts, then you can apply that to your double digit numbers.
Since Double 2 is 4, we know Double 20 is 40. So we can easily solve Double 22 because 20+20=40, 2+2=4, so 40+4=44.
























