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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 269 · 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. 1.8 + ? = 10
  2. 2.62 + ? = 100
  3. 3.4 + ? = 10
  4. 4.9 + ? = 10
  5. 5.78 + ? = 100
  6. 6.2 + ? = 10
  7. 7.34 + ? = 100
  8. 8.51 + ? = 100
  9. 9.15 + ? = 100
  10. 10.19 + ? = 100
  11. 11.1 + ? = 10
  12. 12.65 + ? = 100
  13. 13.3 + ? = 10
  14. 14.20 + ? = 100
  15. 15.57 + ? = 100
  16. 16.49 + ? = 100
  17. 17.50 + ? = 100
  18. 18.6 + ? = 10
  19. 19.44 + ? = 100
  20. 20.53 + ? = 100
  21. 21.11 + ? = 100
  22. 22.24 + ? = 100
  23. 23.5 + ? = 10
  24. 24.16 + ? = 100
  25. 25.7 + ? = 10
  26. 26.87 + ? = 100
  27. 27.79 + ? = 100
  28. 28.30 + ? = 100
  29. 29.41 + ? = 100
  30. 30.85 + ? = 100
  31. 31.56 + ? = 100
  32. 32.88 + ? = 100
  33. 33.33 + ? = 100
  34. 34.60 + ? = 100
  35. 35.29 + ? = 100
  36. 36.71 + ? = 100
  37. 37.27 + ? = 100
  38. 38.14 + ? = 100
  39. 39.38 + ? = 100
  40. 40.25 + ? = 100

Answer key

  1. 2
  2. 38
  3. 6
  4. 1
  5. 22
  6. 8
  7. 66
  8. 49
  9. 85
  10. 81
  11. 9
  12. 35
  13. 7
  14. 80
  15. 43
  16. 51
  17. 50
  18. 4
  19. 56
  20. 47
  21. 89
  22. 76
  23. 5
  24. 84
  25. 3
  26. 13
  27. 21
  28. 70
  29. 59
  30. 15
  31. 44
  32. 12
  33. 67
  34. 40
  35. 71
  36. 29
  37. 73
  38. 86
  39. 62
  40. 75

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