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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 12 · 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. 2.70 + ? = 100
  3. 3.68 + ? = 100
  4. 4.30 + ? = 100
  5. 5.24 + ? = 100
  6. 6.2 + ? = 10
  7. 7.46 + ? = 100
  8. 8.77 + ? = 100
  9. 9.9 + ? = 10
  10. 10.17 + ? = 100
  11. 11.49 + ? = 100
  12. 12.76 + ? = 100
  13. 13.15 + ? = 100
  14. 14.19 + ? = 100
  15. 15.72 + ? = 100
  16. 16.40 + ? = 100
  17. 17.84 + ? = 100
  18. 18.6 + ? = 10
  19. 19.33 + ? = 100
  20. 20.41 + ? = 100
  21. 21.80 + ? = 100
  22. 22.5 + ? = 10
  23. 23.23 + ? = 100
  24. 24.87 + ? = 100
  25. 25.57 + ? = 100
  26. 26.82 + ? = 100
  27. 27.13 + ? = 100
  28. 28.1 + ? = 10
  29. 29.21 + ? = 100
  30. 30.34 + ? = 100
  31. 31.4 + ? = 10
  32. 32.12 + ? = 100
  33. 33.8 + ? = 10
  34. 34.52 + ? = 100
  35. 35.3 + ? = 10
  36. 36.11 + ? = 100
  37. 37.74 + ? = 100
  38. 38.60 + ? = 100
  39. 39.35 + ? = 100
  40. 40.31 + ? = 100

Answer key

  1. 3
  2. 30
  3. 32
  4. 70
  5. 76
  6. 8
  7. 54
  8. 23
  9. 1
  10. 83
  11. 51
  12. 24
  13. 85
  14. 81
  15. 28
  16. 60
  17. 16
  18. 4
  19. 67
  20. 59
  21. 20
  22. 5
  23. 77
  24. 13
  25. 43
  26. 18
  27. 87
  28. 9
  29. 79
  30. 66
  31. 6
  32. 88
  33. 2
  34. 48
  35. 7
  36. 89
  37. 26
  38. 40
  39. 65
  40. 69

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