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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 639 · 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. 1.49 + ? = 100
  2. 2.7 + ? = 10
  3. 3.2 + ? = 10
  4. 4.60 + ? = 100
  5. 5.15 + ? = 100
  6. 6.33 + ? = 100
  7. 7.76 + ? = 100
  8. 8.5 + ? = 10
  9. 9.79 + ? = 100
  10. 10.8 + ? = 10
  11. 11.4 + ? = 10
  12. 12.13 + ? = 100
  13. 13.67 + ? = 100
  14. 14.9 + ? = 10
  15. 15.1 + ? = 10
  16. 16.75 + ? = 100
  17. 17.20 + ? = 100
  18. 18.56 + ? = 100
  19. 19.3 + ? = 10
  20. 20.19 + ? = 100
  21. 21.16 + ? = 100
  22. 22.6 + ? = 10
  23. 23.22 + ? = 100
  24. 24.73 + ? = 100
  25. 25.87 + ? = 100
  26. 26.58 + ? = 100
  27. 27.86 + ? = 100
  28. 28.14 + ? = 100
  29. 29.84 + ? = 100
  30. 30.25 + ? = 100
  31. 31.51 + ? = 100
  32. 32.68 + ? = 100
  33. 33.40 + ? = 100
  34. 34.81 + ? = 100
  35. 35.27 + ? = 100
  36. 36.18 + ? = 100
  37. 37.65 + ? = 100
  38. 38.21 + ? = 100
  39. 39.37 + ? = 100
  40. 40.83 + ? = 100

Answer key

  1. 51
  2. 3
  3. 8
  4. 40
  5. 85
  6. 67
  7. 24
  8. 5
  9. 21
  10. 2
  11. 6
  12. 87
  13. 33
  14. 1
  15. 9
  16. 25
  17. 80
  18. 44
  19. 7
  20. 81
  21. 84
  22. 4
  23. 78
  24. 27
  25. 13
  26. 42
  27. 14
  28. 86
  29. 16
  30. 75
  31. 49
  32. 32
  33. 60
  34. 19
  35. 73
  36. 82
  37. 35
  38. 79
  39. 63
  40. 17

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