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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 171 · 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. 1.25 + ? = 100
  2. 2.5 + ? = 10
  3. 3.34 + ? = 100
  4. 4.4 + ? = 10
  5. 5.26 + ? = 100
  6. 6.36 + ? = 100
  7. 7.3 + ? = 10
  8. 8.46 + ? = 100
  9. 9.56 + ? = 100
  10. 10.8 + ? = 10
  11. 11.6 + ? = 10
  12. 12.12 + ? = 100
  13. 13.33 + ? = 100
  14. 14.1 + ? = 10
  15. 15.9 + ? = 10
  16. 16.7 + ? = 10
  17. 17.68 + ? = 100
  18. 18.15 + ? = 100
  19. 19.37 + ? = 100
  20. 20.59 + ? = 100
  21. 21.67 + ? = 100
  22. 22.2 + ? = 10
  23. 23.71 + ? = 100
  24. 24.22 + ? = 100
  25. 25.62 + ? = 100
  26. 26.45 + ? = 100
  27. 27.50 + ? = 100
  28. 28.75 + ? = 100
  29. 29.32 + ? = 100
  30. 30.44 + ? = 100
  31. 31.61 + ? = 100
  32. 32.58 + ? = 100
  33. 33.60 + ? = 100
  34. 34.64 + ? = 100
  35. 35.57 + ? = 100
  36. 36.74 + ? = 100
  37. 37.27 + ? = 100
  38. 38.13 + ? = 100
  39. 39.43 + ? = 100
  40. 40.42 + ? = 100

Answer key

  1. 75
  2. 5
  3. 66
  4. 6
  5. 74
  6. 64
  7. 7
  8. 54
  9. 44
  10. 2
  11. 4
  12. 88
  13. 67
  14. 9
  15. 1
  16. 3
  17. 32
  18. 85
  19. 63
  20. 41
  21. 33
  22. 8
  23. 29
  24. 78
  25. 38
  26. 55
  27. 50
  28. 25
  29. 68
  30. 56
  31. 39
  32. 42
  33. 40
  34. 36
  35. 43
  36. 26
  37. 73
  38. 87
  39. 57
  40. 58

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