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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 155 · 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. 1.7 + ? = 10
  2. 2.82 + ? = 100
  3. 3.2 + ? = 10
  4. 4.3 + ? = 10
  5. 5.8 + ? = 10
  6. 6.56 + ? = 100
  7. 7.9 + ? = 10
  8. 8.6 + ? = 10
  9. 9.11 + ? = 100
  10. 10.44 + ? = 100
  11. 11.47 + ? = 100
  12. 12.5 + ? = 10
  13. 13.4 + ? = 10
  14. 14.45 + ? = 100
  15. 15.35 + ? = 100
  16. 16.89 + ? = 100
  17. 17.68 + ? = 100
  18. 18.23 + ? = 100
  19. 19.16 + ? = 100
  20. 20.1 + ? = 10
  21. 21.20 + ? = 100
  22. 22.85 + ? = 100
  23. 23.78 + ? = 100
  24. 24.27 + ? = 100
  25. 25.65 + ? = 100
  26. 26.79 + ? = 100
  27. 27.17 + ? = 100
  28. 28.19 + ? = 100
  29. 29.14 + ? = 100
  30. 30.33 + ? = 100
  31. 31.40 + ? = 100
  32. 32.69 + ? = 100
  33. 33.49 + ? = 100
  34. 34.88 + ? = 100
  35. 35.37 + ? = 100
  36. 36.74 + ? = 100
  37. 37.86 + ? = 100
  38. 38.67 + ? = 100
  39. 39.58 + ? = 100
  40. 40.50 + ? = 100

Answer key

  1. 3
  2. 18
  3. 8
  4. 7
  5. 2
  6. 44
  7. 1
  8. 4
  9. 89
  10. 56
  11. 53
  12. 5
  13. 6
  14. 55
  15. 65
  16. 11
  17. 32
  18. 77
  19. 84
  20. 9
  21. 80
  22. 15
  23. 22
  24. 73
  25. 35
  26. 21
  27. 83
  28. 81
  29. 86
  30. 67
  31. 60
  32. 31
  33. 51
  34. 12
  35. 63
  36. 26
  37. 14
  38. 33
  39. 42
  40. 50

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