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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 531 · 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. 2.3 + ? = 10
  3. 3.7 + ? = 10
  4. 4.56 + ? = 100
  5. 5.64 + ? = 100
  6. 6.86 + ? = 100
  7. 7.8 + ? = 10
  8. 8.6 + ? = 10
  9. 9.1 + ? = 10
  10. 10.88 + ? = 100
  11. 11.2 + ? = 10
  12. 12.74 + ? = 100
  13. 13.20 + ? = 100
  14. 14.55 + ? = 100
  15. 15.5 + ? = 10
  16. 16.4 + ? = 10
  17. 17.61 + ? = 100
  18. 18.28 + ? = 100
  19. 19.17 + ? = 100
  20. 20.76 + ? = 100
  21. 21.70 + ? = 100
  22. 22.30 + ? = 100
  23. 23.19 + ? = 100
  24. 24.35 + ? = 100
  25. 25.38 + ? = 100
  26. 26.73 + ? = 100
  27. 27.21 + ? = 100
  28. 28.43 + ? = 100
  29. 29.36 + ? = 100
  30. 30.23 + ? = 100
  31. 31.62 + ? = 100
  32. 32.48 + ? = 100
  33. 33.87 + ? = 100
  34. 34.68 + ? = 100
  35. 35.63 + ? = 100
  36. 36.49 + ? = 100
  37. 37.45 + ? = 100
  38. 38.13 + ? = 100
  39. 39.58 + ? = 100
  40. 40.77 + ? = 100

Answer key

  1. 1
  2. 7
  3. 3
  4. 44
  5. 36
  6. 14
  7. 2
  8. 4
  9. 9
  10. 12
  11. 8
  12. 26
  13. 80
  14. 45
  15. 5
  16. 6
  17. 39
  18. 72
  19. 83
  20. 24
  21. 30
  22. 70
  23. 81
  24. 65
  25. 62
  26. 27
  27. 79
  28. 57
  29. 64
  30. 77
  31. 38
  32. 52
  33. 13
  34. 32
  35. 37
  36. 51
  37. 55
  38. 87
  39. 42
  40. 23

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