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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 109 · 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. 1.11 + ? = 100
  2. 2.81 + ? = 100
  3. 3.2 + ? = 10
  4. 4.87 + ? = 100
  5. 5.23 + ? = 100
  6. 6.54 + ? = 100
  7. 7.33 + ? = 100
  8. 8.35 + ? = 100
  9. 9.9 + ? = 10
  10. 10.65 + ? = 100
  11. 11.3 + ? = 10
  12. 12.7 + ? = 10
  13. 13.1 + ? = 10
  14. 14.6 + ? = 10
  15. 15.55 + ? = 100
  16. 16.4 + ? = 10
  17. 17.74 + ? = 100
  18. 18.27 + ? = 100
  19. 19.8 + ? = 10
  20. 20.45 + ? = 100
  21. 21.68 + ? = 100
  22. 22.78 + ? = 100
  23. 23.19 + ? = 100
  24. 24.88 + ? = 100
  25. 25.82 + ? = 100
  26. 26.37 + ? = 100
  27. 27.44 + ? = 100
  28. 28.67 + ? = 100
  29. 29.34 + ? = 100
  30. 30.52 + ? = 100
  31. 31.50 + ? = 100
  32. 32.76 + ? = 100
  33. 33.42 + ? = 100
  34. 34.18 + ? = 100
  35. 35.17 + ? = 100
  36. 36.16 + ? = 100
  37. 37.48 + ? = 100
  38. 38.89 + ? = 100
  39. 39.32 + ? = 100
  40. 40.80 + ? = 100

Answer key

  1. 89
  2. 19
  3. 8
  4. 13
  5. 77
  6. 46
  7. 67
  8. 65
  9. 1
  10. 35
  11. 7
  12. 3
  13. 9
  14. 4
  15. 45
  16. 6
  17. 26
  18. 73
  19. 2
  20. 55
  21. 32
  22. 22
  23. 81
  24. 12
  25. 18
  26. 63
  27. 56
  28. 33
  29. 66
  30. 48
  31. 50
  32. 24
  33. 58
  34. 82
  35. 83
  36. 84
  37. 52
  38. 11
  39. 68
  40. 20

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