Sunday, December 20, 2015

Addition Facts

Research has shown that one of the most effective ways to help students to understand addition better if the skills are taught in a certain sequence.  We start with the easiest facts first, and they get harder as students master each strategy.  We do not move on to a new strategy until each one is solid.  Many of the latter skills may be learned in second or third grade, depending on how quickly each child moves.

1.  Commutative Property (the turn-around facts)    3+4 is the same as 4+3
2.  Adding one more (means getting the next number) N+1, 1+N
3.  Making ten (a pair of numbers that make ten) 4+6, 3+7 ***we are on this now
4.  The teens numbers   N+10  (10+4, 8+10)
5.  9 plus a number (means adding 10 minus 1) 9+3, 5+9
6.  Double numbers (3+3, 7+7)
7.  Near doubles (If I know the double, I know 1 more than the double or 1 less than the double) 5+4, 6+5
8.  Numbers that are 2 apart (their sum + the double of the middle, i.e., 5+7=6+6+12)
9.  Adding two to a number (5+2, 7+2) means skipping a number
10.  Near tens (the sum of two numbers that is one more than or one less than 10 (3+6, 7+4, 8+3)
11.  Last remaining four facts (do not fit into categories above) 8+4, 4+8, 8+5, 5+8


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