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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 449 · 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. 1.70 + ? = 100
  2. 2.9 + ? = 10
  3. 3.78 + ? = 100
  4. 4.8 + ? = 10
  5. 5.3 + ? = 10
  6. 6.37 + ? = 100
  7. 7.58 + ? = 100
  8. 8.43 + ? = 100
  9. 9.42 + ? = 100
  10. 10.6 + ? = 10
  11. 11.21 + ? = 100
  12. 12.7 + ? = 10
  13. 13.26 + ? = 100
  14. 14.4 + ? = 10
  15. 15.23 + ? = 100
  16. 16.1 + ? = 10
  17. 17.2 + ? = 10
  18. 18.85 + ? = 100
  19. 19.45 + ? = 100
  20. 20.68 + ? = 100
  21. 21.20 + ? = 100
  22. 22.30 + ? = 100
  23. 23.18 + ? = 100
  24. 24.50 + ? = 100
  25. 25.80 + ? = 100
  26. 26.60 + ? = 100
  27. 27.46 + ? = 100
  28. 28.81 + ? = 100
  29. 29.67 + ? = 100
  30. 30.53 + ? = 100
  31. 31.41 + ? = 100
  32. 32.84 + ? = 100
  33. 33.74 + ? = 100
  34. 34.24 + ? = 100
  35. 35.38 + ? = 100
  36. 36.5 + ? = 10
  37. 37.13 + ? = 100
  38. 38.11 + ? = 100
  39. 39.66 + ? = 100
  40. 40.25 + ? = 100

Answer key

  1. 30
  2. 1
  3. 22
  4. 2
  5. 7
  6. 63
  7. 42
  8. 57
  9. 58
  10. 4
  11. 79
  12. 3
  13. 74
  14. 6
  15. 77
  16. 9
  17. 8
  18. 15
  19. 55
  20. 32
  21. 80
  22. 70
  23. 82
  24. 50
  25. 20
  26. 40
  27. 54
  28. 19
  29. 33
  30. 47
  31. 59
  32. 16
  33. 26
  34. 76
  35. 62
  36. 5
  37. 87
  38. 89
  39. 34
  40. 75

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