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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 21 · 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. 2.9 + ? = 10
  3. 3.6 + ? = 10
  4. 4.5 + ? = 10
  5. 5.48 + ? = 100
  6. 6.61 + ? = 100
  7. 7.66 + ? = 100
  8. 8.7 + ? = 10
  9. 9.2 + ? = 10
  10. 10.37 + ? = 100
  11. 11.13 + ? = 100
  12. 12.1 + ? = 10
  13. 13.8 + ? = 10
  14. 14.16 + ? = 100
  15. 15.63 + ? = 100
  16. 16.3 + ? = 10
  17. 17.30 + ? = 100
  18. 18.55 + ? = 100
  19. 19.49 + ? = 100
  20. 20.62 + ? = 100
  21. 21.26 + ? = 100
  22. 22.18 + ? = 100
  23. 23.80 + ? = 100
  24. 24.14 + ? = 100
  25. 25.69 + ? = 100
  26. 26.72 + ? = 100
  27. 27.56 + ? = 100
  28. 28.31 + ? = 100
  29. 29.22 + ? = 100
  30. 30.45 + ? = 100
  31. 31.39 + ? = 100
  32. 32.58 + ? = 100
  33. 33.74 + ? = 100
  34. 34.64 + ? = 100
  35. 35.11 + ? = 100
  36. 36.25 + ? = 100
  37. 37.38 + ? = 100
  38. 38.68 + ? = 100
  39. 39.4 + ? = 10
  40. 40.28 + ? = 100

Answer key

  1. 64
  2. 1
  3. 4
  4. 5
  5. 52
  6. 39
  7. 34
  8. 3
  9. 8
  10. 63
  11. 87
  12. 9
  13. 2
  14. 84
  15. 37
  16. 7
  17. 70
  18. 45
  19. 51
  20. 38
  21. 74
  22. 82
  23. 20
  24. 86
  25. 31
  26. 28
  27. 44
  28. 69
  29. 78
  30. 55
  31. 61
  32. 42
  33. 26
  34. 36
  35. 89
  36. 75
  37. 62
  38. 32
  39. 6
  40. 72

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