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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 375 · 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. 2.4 + ? = 10
  3. 3.2 + ? = 10
  4. 4.8 + ? = 10
  5. 5.49 + ? = 100
  6. 6.6 + ? = 10
  7. 7.69 + ? = 100
  8. 8.53 + ? = 100
  9. 9.64 + ? = 100
  10. 10.9 + ? = 10
  11. 11.15 + ? = 100
  12. 12.80 + ? = 100
  13. 13.52 + ? = 100
  14. 14.12 + ? = 100
  15. 15.23 + ? = 100
  16. 16.1 + ? = 10
  17. 17.5 + ? = 10
  18. 18.46 + ? = 100
  19. 19.87 + ? = 100
  20. 20.63 + ? = 100
  21. 21.89 + ? = 100
  22. 22.16 + ? = 100
  23. 23.74 + ? = 100
  24. 24.11 + ? = 100
  25. 25.84 + ? = 100
  26. 26.20 + ? = 100
  27. 27.70 + ? = 100
  28. 28.57 + ? = 100
  29. 29.3 + ? = 10
  30. 30.28 + ? = 100
  31. 31.35 + ? = 100
  32. 32.60 + ? = 100
  33. 33.26 + ? = 100
  34. 34.30 + ? = 100
  35. 35.51 + ? = 100
  36. 36.44 + ? = 100
  37. 37.21 + ? = 100
  38. 38.32 + ? = 100
  39. 39.66 + ? = 100
  40. 40.22 + ? = 100

Answer key

  1. 3
  2. 6
  3. 8
  4. 2
  5. 51
  6. 4
  7. 31
  8. 47
  9. 36
  10. 1
  11. 85
  12. 20
  13. 48
  14. 88
  15. 77
  16. 9
  17. 5
  18. 54
  19. 13
  20. 37
  21. 11
  22. 84
  23. 26
  24. 89
  25. 16
  26. 80
  27. 30
  28. 43
  29. 7
  30. 72
  31. 65
  32. 40
  33. 74
  34. 70
  35. 49
  36. 56
  37. 79
  38. 68
  39. 34
  40. 78

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