Making Landmark or Friendly Numbers

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Presentation transcript:

Making Landmark or Friendly Numbers

Category 1 Single digit numbers that are one away from landmark/friendly number

10 + 2 9 + 2 9 + 5 9 + 8 9 + 9

20 + 5 19 + 5 19 + 7 19 + 8

19 + 1 19 + 15 19 + 27 19 + 18

29 + 1 29 + 5 29 + 13 29 + 29

40 + 4 39 + 4 39 + 15 39 + 39

49 + 1 49 + 8 49 + 16 49 + 27

60 + 7 59 + 1 + 6 59 + 7 59 + 12 59 + 22

70 + 8 69 + 1 + 7 69 + 8 69 + 13

80 + 4 79 + 1 + 3 79 + 4 79 + 14

20 + 5 19 + 5 19 + 7 19 + 8

Category 2 One addend is 2 away from a multiple of ten or landmark/friendly number.

10 + 5 8 + 2 + 3 8 + 5 8 + 7 8 + 12

8 + 2 8 + 14 8 + 25 8 + 36

18 + 2 18 + 2 + 13 18 + 15 18 + 23

30 + 5 28 + 2 + 3 28 + 5 28 + 7 28 + 16

40 + 4 38 + 2 + 2 38 + 4 38 + 13 38 + 27

50 + 6 48 + 2 + 4 48 + 6 48 + 13 48 + 25

60 + 3 58 + 2 + 1 58 + 3 58 + 14 58 + 26

70 + 7 68 + 2 + 5 68 + 7 68 + 15 68 + 26

80 + 5 78 + 2 + 3 78 + 5 78 + 15 78 + 17

Category 3 Both addends are one or more away from a multiple of ten or landmark/friendly number.

10 + 20 9 + 19 9 + 29 9 + 39

10 + 20 9 + 18 10 + 30 9 + 28

20 + 20 19 + 19 19 + 29 19 + 39

25 + 25 26 + 25 26 + 26 26 + 27

30 + 30 29 + 29 28 + 29 28 + 28

20 + 20 19 + 19 18 + 19 18 + 29

20 + 30 19 + 29 18 + 28 19 + 26

30 + 50 29 + 49 28 + 48 29 + 48

50 + 50 49 + 49 49 + 48 48 + 48