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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 445 · 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. 1.7 + ? = 10
  2. 2.16 + ? = 100
  3. 3.4 + ? = 10
  4. 4.23 + ? = 100
  5. 5.1 + ? = 10
  6. 6.80 + ? = 100
  7. 7.8 + ? = 10
  8. 8.35 + ? = 100
  9. 9.65 + ? = 100
  10. 10.31 + ? = 100
  11. 11.6 + ? = 10
  12. 12.9 + ? = 10
  13. 13.2 + ? = 10
  14. 14.85 + ? = 100
  15. 15.56 + ? = 100
  16. 16.5 + ? = 10
  17. 17.3 + ? = 10
  18. 18.29 + ? = 100
  19. 19.87 + ? = 100
  20. 20.13 + ? = 100
  21. 21.37 + ? = 100
  22. 22.88 + ? = 100
  23. 23.42 + ? = 100
  24. 24.21 + ? = 100
  25. 25.64 + ? = 100
  26. 26.55 + ? = 100
  27. 27.69 + ? = 100
  28. 28.15 + ? = 100
  29. 29.76 + ? = 100
  30. 30.67 + ? = 100
  31. 31.51 + ? = 100
  32. 32.50 + ? = 100
  33. 33.19 + ? = 100
  34. 34.12 + ? = 100
  35. 35.86 + ? = 100
  36. 36.48 + ? = 100
  37. 37.17 + ? = 100
  38. 38.32 + ? = 100
  39. 39.40 + ? = 100
  40. 40.61 + ? = 100

Answer key

  1. 3
  2. 84
  3. 6
  4. 77
  5. 9
  6. 20
  7. 2
  8. 65
  9. 35
  10. 69
  11. 4
  12. 1
  13. 8
  14. 15
  15. 44
  16. 5
  17. 7
  18. 71
  19. 13
  20. 87
  21. 63
  22. 12
  23. 58
  24. 79
  25. 36
  26. 45
  27. 31
  28. 85
  29. 24
  30. 33
  31. 49
  32. 50
  33. 81
  34. 88
  35. 14
  36. 52
  37. 83
  38. 68
  39. 60
  40. 39

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