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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 291 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.22 + ? = 100
  2. 2.3 + ? = 10
  3. 3.88 + ? = 100
  4. 4.28 + ? = 100
  5. 5.1 + ? = 10
  6. 6.8 + ? = 10
  7. 7.6 + ? = 10
  8. 8.5 + ? = 10
  9. 9.87 + ? = 100
  10. 10.31 + ? = 100
  11. 11.74 + ? = 100
  12. 12.4 + ? = 10
  13. 13.48 + ? = 100
  14. 14.49 + ? = 100
  15. 15.7 + ? = 10
  16. 16.75 + ? = 100
  17. 17.13 + ? = 100
  18. 18.41 + ? = 100
  19. 19.9 + ? = 10
  20. 20.61 + ? = 100
  21. 21.55 + ? = 100
  22. 22.58 + ? = 100
  23. 23.36 + ? = 100
  24. 24.56 + ? = 100
  25. 25.30 + ? = 100
  26. 26.33 + ? = 100
  27. 27.69 + ? = 100
  28. 28.25 + ? = 100
  29. 29.59 + ? = 100
  30. 30.19 + ? = 100
  31. 31.76 + ? = 100
  32. 32.27 + ? = 100
  33. 33.29 + ? = 100
  34. 34.2 + ? = 10
  35. 35.11 + ? = 100
  36. 36.62 + ? = 100
  37. 37.23 + ? = 100
  38. 38.20 + ? = 100
  39. 39.86 + ? = 100
  40. 40.54 + ? = 100

Answer key

  1. 78
  2. 7
  3. 12
  4. 72
  5. 9
  6. 2
  7. 4
  8. 5
  9. 13
  10. 69
  11. 26
  12. 6
  13. 52
  14. 51
  15. 3
  16. 25
  17. 87
  18. 59
  19. 1
  20. 39
  21. 45
  22. 42
  23. 64
  24. 44
  25. 70
  26. 67
  27. 31
  28. 75
  29. 41
  30. 81
  31. 24
  32. 73
  33. 71
  34. 8
  35. 89
  36. 38
  37. 77
  38. 80
  39. 14
  40. 46

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