1. Counting by 2’s, 3’s, 5’s, and 10’s
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Counting by 2’s, 3’s, 5’s, and 10’s
Standard 2.1 Numbers, Number Systems and Number
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A. Count using whole numbers to 100 by 1’s, 2’s, 5’s, 10’s

2. How do you count by 1’s? When counting you add one number at a time.
Tip: Look at what number that comes next on a number line or number grid.

3. Count the green boxes. Start with 1.
Can you count by 1’s?
Count the green boxes. Start with 1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

4. Count the green boxes. Start with 37.
Can you count by 1’s?
Count the green boxes. Start with 37. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

5. Count the green boxes. Start with 77.
Can you count by 1’s?
Count the green boxes. Start with 77. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

6. What number is missing? 4 1, 2, 3, ____, 5, 6, 7, 8, 9, 10
12, 13, 14, 15, ____, 17, 18, 19
25, 26, 27, 28, ____, 30, 31, 32
54, 55, ____, 57, 58, 59, 60, 61 4 16 29 56

7. What number is missing? 37 33, 34, 35, 36, ____, 38, 39, 40
47, 48, 49, ____, 51, 52, 53, 54
68, 69, 70, ____, 72, 73, 74, 75
83, 84, 85, 86, 87, 88, 89, ____ 37 50 71 90

8. How do you count by 10’s? When counting you add ten to each number.
Tip: Take any number and keep adding ten.
30 (+10), 40 (+10), 50 (+10), 60

9. Count the red boxes. Start with 10.
Can you count by 10’s?
Count the red boxes. Start with 10. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

10. Count the red boxes. Start with 60.
Can you count by 10’s?
Count the red boxes. Start with 60. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

11. Count the red boxes. Start with 45.
Can you count by 10’s?
Count the red boxes. Start with 45. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

12. Count the red boxes. Start with 22.
Can you count by 10’s?
Count the red boxes. Start with 22. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

13. What number is missing? 30 10, 20, ___, 40 50, 60, ___, 80 70
___, 20, 30, 40
70, 80, 90, ___ 30 70 10
100

14. What number is missing? 58 28, 38, 48, ___ 35, 45, 55, ___ 65
66, 76, 86, ___
62, 72, ___, 92 58 65 96 82

15. How do you count by 5’s? When counting you add five to each number.
Tip: Take any number and keep adding 5.
10 (+5), 15 (+5), 20 (+5), 25

16. Count the purple boxes. Start with 5.
Can you count by 5’s?
Count the purple boxes. Start with 5. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

17. Count the purple boxes. Start with 30.
Can you count by 5’s?
Count the purple boxes. Start with 30. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

18. Count the purple boxes. Start with 55.
Can you count by 5’s?
Count the purple boxes. Start with 55. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

19. What number is missing? 40 25, 30, 35, ___, 45, 50 5, 10, 15, ___, 25
65, 70, ___, 80
80, 85, ___, 95, 100 20 75 90

20. What number is missing? 30 15, 20, 25, ___, 35 85, 90, 95, ___
45, 50, 55, ___, 65
70, ___, 80, 85 30
100 60 75

21. How do you count by 3’s? When counting you add three to each number.
Tip: Take any number and keep adding 3.
6 (+3), 9 (+3), 12 (+3), 15

22. Count the orange boxes. Start with 3.
Can you count by 3’s?
Count the orange boxes. Start with 3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

23. Count the orange boxes. Start with 42.
Can you count by 3’s?
Count the orange boxes. Start with 42. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

24. Count the orange boxes. Start with 46.
Can you count by 3’s?
Count the orange boxes. Start with 46. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

25. Count the orange boxes. Start with 83.
Can you count by 3’s?
Count the orange boxes. Start with 83. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

26. What number is missing? 6, 9, 12, ___, 18 72, 75, ___, 81
24, ___, 30, 33
93, 96, ___, 102 15 78 27 99

27. What number is missing? 41, 44, ___, 50 77, ___, 83, 86
64, 67, 70, ___
32, ___, 38, 41 47 80 73 35

28. How do you count by 2’s? When counting you add two to each number.
Tip: Take any number and keep adding 2.
6 (+2), 8 (+2), 10 (+2), 12

29. Count the yellow squares. Start with 2.
Can you count by 2’s?
Count the yellow squares. Start with 2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

30. Count the yellow squares. Start with 44.
Can you count by 2’s?
Count the yellow squares. Start with 44. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

31. Count the yellow squares. Start with 53.
Can you count by 2’s?
Count the yellow squares. Start with 53. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

32. Count the yellow squares. Start with 79.
Can you count by 2’s?
Count the yellow squares. Start with 79. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

33. What number is missing? 14 10, 12, ___, 16 82, ___, 86, 88
92, 94, 96, 98, ___
70, ___, 74, 76 14 84
100 72

34. What number is missing? 81, 83, ___, 87 ___, 67, 69 33, ___, 37, 39
___, 75, 77 85 65 35 73