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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 265 · 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. 1.2 + ? = 10
  2. 2.67 + ? = 100
  3. 3.4 + ? = 10
  4. 4.57 + ? = 100
  5. 5.23 + ? = 100
  6. 6.14 + ? = 100
  7. 7.44 + ? = 100
  8. 8.6 + ? = 10
  9. 9.17 + ? = 100
  10. 10.56 + ? = 100
  11. 11.15 + ? = 100
  12. 12.59 + ? = 100
  13. 13.72 + ? = 100
  14. 14.78 + ? = 100
  15. 15.5 + ? = 10
  16. 16.3 + ? = 10
  17. 17.8 + ? = 10
  18. 18.80 + ? = 100
  19. 19.75 + ? = 100
  20. 20.39 + ? = 100
  21. 21.53 + ? = 100
  22. 22.74 + ? = 100
  23. 23.19 + ? = 100
  24. 24.68 + ? = 100
  25. 25.62 + ? = 100
  26. 26.27 + ? = 100
  27. 27.52 + ? = 100
  28. 28.30 + ? = 100
  29. 29.26 + ? = 100
  30. 30.36 + ? = 100
  31. 31.7 + ? = 10
  32. 32.40 + ? = 100
  33. 33.12 + ? = 100
  34. 34.48 + ? = 100
  35. 35.60 + ? = 100
  36. 36.50 + ? = 100
  37. 37.24 + ? = 100
  38. 38.51 + ? = 100
  39. 39.29 + ? = 100
  40. 40.49 + ? = 100

Answer key

  1. 8
  2. 33
  3. 6
  4. 43
  5. 77
  6. 86
  7. 56
  8. 4
  9. 83
  10. 44
  11. 85
  12. 41
  13. 28
  14. 22
  15. 5
  16. 7
  17. 2
  18. 20
  19. 25
  20. 61
  21. 47
  22. 26
  23. 81
  24. 32
  25. 38
  26. 73
  27. 48
  28. 70
  29. 74
  30. 64
  31. 3
  32. 60
  33. 88
  34. 52
  35. 40
  36. 50
  37. 76
  38. 49
  39. 71
  40. 51

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