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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 545 · 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. 1.51 + ? = 100
  2. 2.73 + ? = 100
  3. 3.76 + ? = 100
  4. 4.8 + ? = 10
  5. 5.28 + ? = 100
  6. 6.18 + ? = 100
  7. 7.5 + ? = 10
  8. 8.33 + ? = 100
  9. 9.9 + ? = 10
  10. 10.7 + ? = 10
  11. 11.1 + ? = 10
  12. 12.45 + ? = 100
  13. 13.38 + ? = 100
  14. 14.2 + ? = 10
  15. 15.4 + ? = 10
  16. 16.3 + ? = 10
  17. 17.77 + ? = 100
  18. 18.72 + ? = 100
  19. 19.6 + ? = 10
  20. 20.52 + ? = 100
  21. 21.26 + ? = 100
  22. 22.70 + ? = 100
  23. 23.69 + ? = 100
  24. 24.13 + ? = 100
  25. 25.19 + ? = 100
  26. 26.16 + ? = 100
  27. 27.37 + ? = 100
  28. 28.34 + ? = 100
  29. 29.23 + ? = 100
  30. 30.17 + ? = 100
  31. 31.12 + ? = 100
  32. 32.87 + ? = 100
  33. 33.30 + ? = 100
  34. 34.58 + ? = 100
  35. 35.53 + ? = 100
  36. 36.22 + ? = 100
  37. 37.68 + ? = 100
  38. 38.56 + ? = 100
  39. 39.85 + ? = 100
  40. 40.81 + ? = 100

Answer key

  1. 49
  2. 27
  3. 24
  4. 2
  5. 72
  6. 82
  7. 5
  8. 67
  9. 1
  10. 3
  11. 9
  12. 55
  13. 62
  14. 8
  15. 6
  16. 7
  17. 23
  18. 28
  19. 4
  20. 48
  21. 74
  22. 30
  23. 31
  24. 87
  25. 81
  26. 84
  27. 63
  28. 66
  29. 77
  30. 83
  31. 88
  32. 13
  33. 70
  34. 42
  35. 47
  36. 78
  37. 32
  38. 44
  39. 15
  40. 19

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