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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 97 · 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. 1.35 + ? = 100
  2. 2.61 + ? = 100
  3. 3.60 + ? = 100
  4. 4.80 + ? = 100
  5. 5.72 + ? = 100
  6. 6.76 + ? = 100
  7. 7.56 + ? = 100
  8. 8.9 + ? = 10
  9. 9.40 + ? = 100
  10. 10.45 + ? = 100
  11. 11.7 + ? = 10
  12. 12.68 + ? = 100
  13. 13.4 + ? = 10
  14. 14.16 + ? = 100
  15. 15.30 + ? = 100
  16. 16.62 + ? = 100
  17. 17.3 + ? = 10
  18. 18.73 + ? = 100
  19. 19.46 + ? = 100
  20. 20.5 + ? = 10
  21. 21.34 + ? = 100
  22. 22.52 + ? = 100
  23. 23.8 + ? = 10
  24. 24.64 + ? = 100
  25. 25.2 + ? = 10
  26. 26.18 + ? = 100
  27. 27.78 + ? = 100
  28. 28.21 + ? = 100
  29. 29.63 + ? = 100
  30. 30.37 + ? = 100
  31. 31.48 + ? = 100
  32. 32.87 + ? = 100
  33. 33.17 + ? = 100
  34. 34.20 + ? = 100
  35. 35.23 + ? = 100
  36. 36.66 + ? = 100
  37. 37.88 + ? = 100
  38. 38.70 + ? = 100
  39. 39.33 + ? = 100
  40. 40.1 + ? = 10

Answer key

  1. 65
  2. 39
  3. 40
  4. 20
  5. 28
  6. 24
  7. 44
  8. 1
  9. 60
  10. 55
  11. 3
  12. 32
  13. 6
  14. 84
  15. 70
  16. 38
  17. 7
  18. 27
  19. 54
  20. 5
  21. 66
  22. 48
  23. 2
  24. 36
  25. 8
  26. 82
  27. 22
  28. 79
  29. 37
  30. 63
  31. 52
  32. 13
  33. 83
  34. 80
  35. 77
  36. 34
  37. 12
  38. 30
  39. 67
  40. 9

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