Group Rima teaching each other the family of facts.

In Xzavier's words, if you know one fact you actually know four! We now know the family of number facts to 10, 20 and 30 - write in the comments section if you can give an example too... 7 + 3 = 10 3 + 7 = 10 10 - 7 = 3 10 - 3 = 7; 18 + 2 = 20 2 + 18 = 20 20 - 2 = 18 20 - 18 = 2