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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 63 · 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. 1.36 + ? = 100
  2. 2.72 + ? = 100
  3. 3.53 + ? = 100
  4. 4.8 + ? = 10
  5. 5.13 + ? = 100
  6. 6.4 + ? = 10
  7. 7.18 + ? = 100
  8. 8.73 + ? = 100
  9. 9.3 + ? = 10
  10. 10.29 + ? = 100
  11. 11.9 + ? = 10
  12. 12.6 + ? = 10
  13. 13.81 + ? = 100
  14. 14.5 + ? = 10
  15. 15.76 + ? = 100
  16. 16.2 + ? = 10
  17. 17.33 + ? = 100
  18. 18.1 + ? = 10
  19. 19.69 + ? = 100
  20. 20.62 + ? = 100
  21. 21.40 + ? = 100
  22. 22.35 + ? = 100
  23. 23.88 + ? = 100
  24. 24.52 + ? = 100
  25. 25.56 + ? = 100
  26. 26.7 + ? = 10
  27. 27.61 + ? = 100
  28. 28.64 + ? = 100
  29. 29.23 + ? = 100
  30. 30.78 + ? = 100
  31. 31.68 + ? = 100
  32. 32.66 + ? = 100
  33. 33.50 + ? = 100
  34. 34.57 + ? = 100
  35. 35.19 + ? = 100
  36. 36.20 + ? = 100
  37. 37.46 + ? = 100
  38. 38.74 + ? = 100
  39. 39.84 + ? = 100
  40. 40.21 + ? = 100

Answer key

  1. 64
  2. 28
  3. 47
  4. 2
  5. 87
  6. 6
  7. 82
  8. 27
  9. 7
  10. 71
  11. 1
  12. 4
  13. 19
  14. 5
  15. 24
  16. 8
  17. 67
  18. 9
  19. 31
  20. 38
  21. 60
  22. 65
  23. 12
  24. 48
  25. 44
  26. 3
  27. 39
  28. 36
  29. 77
  30. 22
  31. 32
  32. 34
  33. 50
  34. 43
  35. 81
  36. 80
  37. 54
  38. 26
  39. 16
  40. 79

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