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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 640 · 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. 2.51 + ? = 100
  3. 3.7 + ? = 10
  4. 4.65 + ? = 100
  5. 5.34 + ? = 100
  6. 6.1 + ? = 10
  7. 7.8 + ? = 10
  8. 8.4 + ? = 10
  9. 9.27 + ? = 100
  10. 10.19 + ? = 100
  11. 11.22 + ? = 100
  12. 12.5 + ? = 10
  13. 13.44 + ? = 100
  14. 14.43 + ? = 100
  15. 15.6 + ? = 10
  16. 16.20 + ? = 100
  17. 17.49 + ? = 100
  18. 18.2 + ? = 10
  19. 19.63 + ? = 100
  20. 20.87 + ? = 100
  21. 21.64 + ? = 100
  22. 22.3 + ? = 10
  23. 23.47 + ? = 100
  24. 24.84 + ? = 100
  25. 25.48 + ? = 100
  26. 26.86 + ? = 100
  27. 27.24 + ? = 100
  28. 28.73 + ? = 100
  29. 29.69 + ? = 100
  30. 30.14 + ? = 100
  31. 31.62 + ? = 100
  32. 32.83 + ? = 100
  33. 33.60 + ? = 100
  34. 34.15 + ? = 100
  35. 35.37 + ? = 100
  36. 36.23 + ? = 100
  37. 37.54 + ? = 100
  38. 38.74 + ? = 100
  39. 39.55 + ? = 100
  40. 40.88 + ? = 100

Answer key

  1. 1
  2. 49
  3. 3
  4. 35
  5. 66
  6. 9
  7. 2
  8. 6
  9. 73
  10. 81
  11. 78
  12. 5
  13. 56
  14. 57
  15. 4
  16. 80
  17. 51
  18. 8
  19. 37
  20. 13
  21. 36
  22. 7
  23. 53
  24. 16
  25. 52
  26. 14
  27. 76
  28. 27
  29. 31
  30. 86
  31. 38
  32. 17
  33. 40
  34. 85
  35. 63
  36. 77
  37. 46
  38. 26
  39. 45
  40. 12

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