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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 257 · 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. 2.48 + ? = 100
  3. 3.72 + ? = 100
  4. 4.36 + ? = 100
  5. 5.5 + ? = 10
  6. 6.9 + ? = 10
  7. 7.62 + ? = 100
  8. 8.86 + ? = 100
  9. 9.13 + ? = 100
  10. 10.6 + ? = 10
  11. 11.3 + ? = 10
  12. 12.88 + ? = 100
  13. 13.2 + ? = 10
  14. 14.55 + ? = 100
  15. 15.1 + ? = 10
  16. 16.67 + ? = 100
  17. 17.51 + ? = 100
  18. 18.4 + ? = 10
  19. 19.8 + ? = 10
  20. 20.17 + ? = 100
  21. 21.30 + ? = 100
  22. 22.37 + ? = 100
  23. 23.26 + ? = 100
  24. 24.21 + ? = 100
  25. 25.23 + ? = 100
  26. 26.19 + ? = 100
  27. 27.24 + ? = 100
  28. 28.50 + ? = 100
  29. 29.69 + ? = 100
  30. 30.56 + ? = 100
  31. 31.83 + ? = 100
  32. 32.31 + ? = 100
  33. 33.53 + ? = 100
  34. 34.60 + ? = 100
  35. 35.87 + ? = 100
  36. 36.65 + ? = 100
  37. 37.54 + ? = 100
  38. 38.52 + ? = 100
  39. 39.77 + ? = 100
  40. 40.39 + ? = 100

Answer key

  1. 3
  2. 52
  3. 28
  4. 64
  5. 5
  6. 1
  7. 38
  8. 14
  9. 87
  10. 4
  11. 7
  12. 12
  13. 8
  14. 45
  15. 9
  16. 33
  17. 49
  18. 6
  19. 2
  20. 83
  21. 70
  22. 63
  23. 74
  24. 79
  25. 77
  26. 81
  27. 76
  28. 50
  29. 31
  30. 44
  31. 17
  32. 69
  33. 47
  34. 40
  35. 13
  36. 35
  37. 46
  38. 48
  39. 23
  40. 61

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