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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 10 · 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. 1.1 + ? = 10
  2. 2.67 + ? = 100
  3. 3.4 + ? = 10
  4. 4.2 + ? = 10
  5. 5.89 + ? = 100
  6. 6.19 + ? = 100
  7. 7.6 + ? = 10
  8. 8.15 + ? = 100
  9. 9.62 + ? = 100
  10. 10.87 + ? = 100
  11. 11.12 + ? = 100
  12. 12.18 + ? = 100
  13. 13.56 + ? = 100
  14. 14.3 + ? = 10
  15. 15.81 + ? = 100
  16. 16.49 + ? = 100
  17. 17.11 + ? = 100
  18. 18.33 + ? = 100
  19. 19.63 + ? = 100
  20. 20.28 + ? = 100
  21. 21.5 + ? = 10
  22. 22.50 + ? = 100
  23. 23.40 + ? = 100
  24. 24.8 + ? = 10
  25. 25.34 + ? = 100
  26. 26.9 + ? = 10
  27. 27.85 + ? = 100
  28. 28.45 + ? = 100
  29. 29.69 + ? = 100
  30. 30.16 + ? = 100
  31. 31.26 + ? = 100
  32. 32.22 + ? = 100
  33. 33.74 + ? = 100
  34. 34.68 + ? = 100
  35. 35.60 + ? = 100
  36. 36.7 + ? = 10
  37. 37.64 + ? = 100
  38. 38.71 + ? = 100
  39. 39.59 + ? = 100
  40. 40.25 + ? = 100

Answer key

  1. 9
  2. 33
  3. 6
  4. 8
  5. 11
  6. 81
  7. 4
  8. 85
  9. 38
  10. 13
  11. 88
  12. 82
  13. 44
  14. 7
  15. 19
  16. 51
  17. 89
  18. 67
  19. 37
  20. 72
  21. 5
  22. 50
  23. 60
  24. 2
  25. 66
  26. 1
  27. 15
  28. 55
  29. 31
  30. 84
  31. 74
  32. 78
  33. 26
  34. 32
  35. 40
  36. 3
  37. 36
  38. 29
  39. 41
  40. 75

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