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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 340 · 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. 1.26 + ? = 100
  2. 2.11 + ? = 100
  3. 3.74 + ? = 100
  4. 4.3 + ? = 10
  5. 5.51 + ? = 100
  6. 6.4 + ? = 10
  7. 7.2 + ? = 10
  8. 8.1 + ? = 10
  9. 9.79 + ? = 100
  10. 10.56 + ? = 100
  11. 11.41 + ? = 100
  12. 12.21 + ? = 100
  13. 13.53 + ? = 100
  14. 14.9 + ? = 10
  15. 15.8 + ? = 10
  16. 16.13 + ? = 100
  17. 17.71 + ? = 100
  18. 18.61 + ? = 100
  19. 19.76 + ? = 100
  20. 20.57 + ? = 100
  21. 21.6 + ? = 10
  22. 22.29 + ? = 100
  23. 23.88 + ? = 100
  24. 24.50 + ? = 100
  25. 25.33 + ? = 100
  26. 26.5 + ? = 10
  27. 27.15 + ? = 100
  28. 28.75 + ? = 100
  29. 29.12 + ? = 100
  30. 30.7 + ? = 10
  31. 31.27 + ? = 100
  32. 32.37 + ? = 100
  33. 33.34 + ? = 100
  34. 34.31 + ? = 100
  35. 35.87 + ? = 100
  36. 36.39 + ? = 100
  37. 37.86 + ? = 100
  38. 38.23 + ? = 100
  39. 39.20 + ? = 100
  40. 40.84 + ? = 100

Answer key

  1. 74
  2. 89
  3. 26
  4. 7
  5. 49
  6. 6
  7. 8
  8. 9
  9. 21
  10. 44
  11. 59
  12. 79
  13. 47
  14. 1
  15. 2
  16. 87
  17. 29
  18. 39
  19. 24
  20. 43
  21. 4
  22. 71
  23. 12
  24. 50
  25. 67
  26. 5
  27. 85
  28. 25
  29. 88
  30. 3
  31. 73
  32. 63
  33. 66
  34. 69
  35. 13
  36. 61
  37. 14
  38. 77
  39. 80
  40. 16

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