The document contains examples of addition problems grouped into three categories: Category 1 contains single-digit addition problems adding 10, 20, 30, 40 or other single-digit numbers. Category 2 shows "chunking" multi-digit addition, such as breaking 28 + 24 into 28 + 20 + 2 + 2. Category 3 adds multiples of 10 and 100 to numbers while keeping one addend whole, like 56 + 40.

1. Adding Up
in Chunks

2. Category 1

3. 16 + 10
16 + 20
16 + 40
16 + 42

4. 26 + 10
26 + 30
26 + 50
26 + 53

5. 24 + 10
24 + 30
24 + 50
24 + 55

6. 35 + 10
35 + 20
35 + 40
35 + 42

7. 32 + 10
32 + 30
32 + 50
32 + 55

8. 44 + 10
44 + 20
44 + 30
44 + 35

9. 46 + 20
46 + 30
46 + 50
46 + 53

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

11. 53 + 20
53 + 25
53 + 40
53 + 42

12. 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

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

14. 16 + 20
16 + 25
16 + 30
16 + 36

15. 17 + 10
17 + 14
17 + 30
17 + 35

16. 29 + 10
29 + 15
29 + 20
29 + 24

17. 38 + 20
38 + 26
38 + 30
38 + 33

18. 45 + 30
45 + 38
45 + 40
45 + 46

19. 57 + 10
57 + 14
57 + 30
57 + 36

20. 65 + 30
65 + 36
65 + 50
65 + 57

21. 73 + 30
73 + 38
73 + 50
73 + 58

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

23. 56 + 40
56 + 50
156 + 40
156 + 43

24. 256 + 100
256 + 300
256 + 340
256 + 342

25. 117 + 200
117 + 400
117 + 420
117 + 426

26. 37 + 40
37 + 46
237 + 40
237 + 48

27. 25 + 60
25 + 66
125 + 60
125 + 68

28. 47 + 80
47 + 84
247 + 70
247 + 74

29. 345 + 200
345 + 400
345 + 450
345 + 457

30. 134 + 100
134 + 300
134 + 380
134 + 387

31. 218 + 200
218 + 400
218 + 450
218 + 456