Add/Subt Strategies


Learn the basic facts using strategies
-- doubles (4+4. 8+8) (
doubles practice powerpoint )

--near double or double +1 - (7+8) = double 7 plus one more (powerpoint) (dot patterns)

--count by 2s - (6+2) = 2,4,6 plus 2 more

--count by 3s - (3+6) = 3,6...9 (use 3s song) 

--count by 4s – (4+8) = 4, 8,…12 (use 4s song)

--number in the middle  - (5+7 = 6+6) double the number in the middle of 5 and 7
--+10s (10+7) 1 group of ten and 7 ones = 17
--+9s  - (9 + 4) 4 gives one to 9 and becomes 10 + 3 = 13 or (10+4-1)

-- combinations of 10 - (8+2, 3+7) (combos song)

-- combinations of 11 – (8+3. 4+7) combos of ten +1 more

--looks like near double  - (7-6) or (5-4) answer is always 1

--looks like number in the middle - (8 - 6) or (9 - 7) answer is always 2