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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 106 · 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. 2.45 + ? = 100
  3. 3.3 + ? = 10
  4. 4.5 + ? = 10
  5. 5.80 + ? = 100
  6. 6.6 + ? = 10
  7. 7.33 + ? = 100
  8. 8.89 + ? = 100
  9. 9.4 + ? = 10
  10. 10.1 + ? = 10
  11. 11.2 + ? = 10
  12. 12.69 + ? = 100
  13. 13.7 + ? = 10
  14. 14.26 + ? = 100
  15. 15.65 + ? = 100
  16. 16.60 + ? = 100
  17. 17.8 + ? = 10
  18. 18.73 + ? = 100
  19. 19.54 + ? = 100
  20. 20.55 + ? = 100
  21. 21.68 + ? = 100
  22. 22.52 + ? = 100
  23. 23.43 + ? = 100
  24. 24.28 + ? = 100
  25. 25.20 + ? = 100
  26. 26.83 + ? = 100
  27. 27.85 + ? = 100
  28. 28.79 + ? = 100
  29. 29.22 + ? = 100
  30. 30.21 + ? = 100
  31. 31.81 + ? = 100
  32. 32.29 + ? = 100
  33. 33.27 + ? = 100
  34. 34.63 + ? = 100
  35. 35.15 + ? = 100
  36. 36.46 + ? = 100
  37. 37.39 + ? = 100
  38. 38.49 + ? = 100
  39. 39.86 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 1
  2. 55
  3. 7
  4. 5
  5. 20
  6. 4
  7. 67
  8. 11
  9. 6
  10. 9
  11. 8
  12. 31
  13. 3
  14. 74
  15. 35
  16. 40
  17. 2
  18. 27
  19. 46
  20. 45
  21. 32
  22. 48
  23. 57
  24. 72
  25. 80
  26. 17
  27. 15
  28. 21
  29. 78
  30. 79
  31. 19
  32. 71
  33. 73
  34. 37
  35. 85
  36. 54
  37. 61
  38. 51
  39. 14
  40. 56

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