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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 641 · 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. 1.9 + ? = 10
  2. 2.7 + ? = 10
  3. 3.1 + ? = 10
  4. 4.52 + ? = 100
  5. 5.4 + ? = 10
  6. 6.65 + ? = 100
  7. 7.61 + ? = 100
  8. 8.56 + ? = 100
  9. 9.66 + ? = 100
  10. 10.6 + ? = 10
  11. 11.28 + ? = 100
  12. 12.74 + ? = 100
  13. 13.79 + ? = 100
  14. 14.2 + ? = 10
  15. 15.3 + ? = 10
  16. 16.5 + ? = 10
  17. 17.49 + ? = 100
  18. 18.76 + ? = 100
  19. 19.8 + ? = 10
  20. 20.67 + ? = 100
  21. 21.11 + ? = 100
  22. 22.81 + ? = 100
  23. 23.60 + ? = 100
  24. 24.19 + ? = 100
  25. 25.18 + ? = 100
  26. 26.69 + ? = 100
  27. 27.43 + ? = 100
  28. 28.55 + ? = 100
  29. 29.34 + ? = 100
  30. 30.20 + ? = 100
  31. 31.24 + ? = 100
  32. 32.62 + ? = 100
  33. 33.44 + ? = 100
  34. 34.15 + ? = 100
  35. 35.45 + ? = 100
  36. 36.22 + ? = 100
  37. 37.83 + ? = 100
  38. 38.17 + ? = 100
  39. 39.36 + ? = 100
  40. 40.37 + ? = 100

Answer key

  1. 1
  2. 3
  3. 9
  4. 48
  5. 6
  6. 35
  7. 39
  8. 44
  9. 34
  10. 4
  11. 72
  12. 26
  13. 21
  14. 8
  15. 7
  16. 5
  17. 51
  18. 24
  19. 2
  20. 33
  21. 89
  22. 19
  23. 40
  24. 81
  25. 82
  26. 31
  27. 57
  28. 45
  29. 66
  30. 80
  31. 76
  32. 38
  33. 56
  34. 85
  35. 55
  36. 78
  37. 17
  38. 83
  39. 64
  40. 63

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