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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 581 · 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. 1.1 + ? = 10
  2. 2.32 + ? = 100
  3. 3.22 + ? = 100
  4. 4.23 + ? = 100
  5. 5.8 + ? = 10
  6. 6.3 + ? = 10
  7. 7.20 + ? = 100
  8. 8.85 + ? = 100
  9. 9.7 + ? = 10
  10. 10.26 + ? = 100
  11. 11.9 + ? = 10
  12. 12.21 + ? = 100
  13. 13.67 + ? = 100
  14. 14.56 + ? = 100
  15. 15.70 + ? = 100
  16. 16.12 + ? = 100
  17. 17.4 + ? = 10
  18. 18.81 + ? = 100
  19. 19.57 + ? = 100
  20. 20.34 + ? = 100
  21. 21.6 + ? = 10
  22. 22.50 + ? = 100
  23. 23.5 + ? = 10
  24. 24.2 + ? = 10
  25. 25.86 + ? = 100
  26. 26.52 + ? = 100
  27. 27.60 + ? = 100
  28. 28.19 + ? = 100
  29. 29.73 + ? = 100
  30. 30.83 + ? = 100
  31. 31.18 + ? = 100
  32. 32.33 + ? = 100
  33. 33.29 + ? = 100
  34. 34.49 + ? = 100
  35. 35.30 + ? = 100
  36. 36.27 + ? = 100
  37. 37.61 + ? = 100
  38. 38.24 + ? = 100
  39. 39.6 + ? = 10
  40. 40.31 + ? = 100

Answer key

  1. 9
  2. 68
  3. 78
  4. 77
  5. 2
  6. 7
  7. 80
  8. 15
  9. 3
  10. 74
  11. 1
  12. 79
  13. 33
  14. 44
  15. 30
  16. 88
  17. 6
  18. 19
  19. 43
  20. 66
  21. 4
  22. 50
  23. 5
  24. 8
  25. 14
  26. 48
  27. 40
  28. 81
  29. 27
  30. 17
  31. 82
  32. 67
  33. 71
  34. 51
  35. 70
  36. 73
  37. 39
  38. 76
  39. 4
  40. 69

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