Adding Up in Chunks Decompose and associate number to add efficiently.

Category 1

16 + 10 16 + 20 16 + 40 16 + 42

26 + 10 26 + 30 26 + 50 26 + 53

24 + 10 24 + 30 24 + 50 24 + 55

35 + 10 35 + 20 35 + 40 35 + 42

32 + 10 32 + 30 32 + 50 32 + 55

44 + 10 44 + 20 44 + 30 44 + 35

46 + 20 46 + 30 46 + 50 46 + 53

57 + 10 57 + 20 57 + 30 57 + 33

53 + 20 53 + 25 53 + 40 53 + 42

Category 2 Adding multiples of tens while keeping on number whole and then breaking apart the ones into friendly combinations. Example: 28 + 24 could be “chunked” as 28 + 20 = 48; the 4 could be broken into 2 + 2 so that 48 + 2 = 50; 50 + 2 = 52

18 + 10 18 + 13 18 + 20 18 + 23

16 + 20 16 + 25 16 + 30 16 + 36

17 + 10 17 + 14 17 + 30 17 + 35

29 + 10 29 + 15 29 + 20 29 + 24

38 + 20 38 + 26 38 + 30 38 + 33

45 + 30 45 + 38 45 + 40 45 + 46

57 + 10 57 + 14 57 + 30 57 + 36

65 + 30 65 + 36 65 + 50 65 + 57

73 + 30 73 + 38 73 + 50 73 + 58

Category 3 Adding multiples of tens and one hundred while keeping one number whole.

56 + 40 56 + 50 156 + 40 156 + 43

256 + 100 256 + 300 256 + 340 256 + 342

117 + 200 117 + 400 117 + 420 117 + 426

37 + 40 37 + 46 237 + 40 237 + 48

25 + 60 25 + 66 125 + 60 125 + 68

47 + 80 47 + 84 247 + 70 247 + 74

345 + 200 345 + 400 345 + 450 345 + 457

134 + 100 134 + 300 134 + 380 134 + 387

218 + 200 218 + 400 218 + 450 218 + 456