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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 341 · 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. 1.5 + ? = 10
  2. 2.9 + ? = 10
  3. 3.7 + ? = 10
  4. 4.8 + ? = 10
  5. 5.24 + ? = 100
  6. 6.2 + ? = 10
  7. 7.4 + ? = 10
  8. 8.3 + ? = 10
  9. 9.58 + ? = 100
  10. 10.6 + ? = 10
  11. 11.20 + ? = 100
  12. 12.21 + ? = 100
  13. 13.67 + ? = 100
  14. 14.85 + ? = 100
  15. 15.80 + ? = 100
  16. 16.26 + ? = 100
  17. 17.39 + ? = 100
  18. 18.23 + ? = 100
  19. 19.57 + ? = 100
  20. 20.65 + ? = 100
  21. 21.22 + ? = 100
  22. 22.13 + ? = 100
  23. 23.30 + ? = 100
  24. 24.45 + ? = 100
  25. 25.14 + ? = 100
  26. 26.53 + ? = 100
  27. 27.33 + ? = 100
  28. 28.12 + ? = 100
  29. 29.1 + ? = 10
  30. 30.11 + ? = 100
  31. 31.41 + ? = 100
  32. 32.73 + ? = 100
  33. 33.78 + ? = 100
  34. 34.88 + ? = 100
  35. 35.60 + ? = 100
  36. 36.34 + ? = 100
  37. 37.77 + ? = 100
  38. 38.16 + ? = 100
  39. 39.70 + ? = 100
  40. 40.76 + ? = 100

Answer key

  1. 5
  2. 1
  3. 3
  4. 2
  5. 76
  6. 8
  7. 6
  8. 7
  9. 42
  10. 4
  11. 80
  12. 79
  13. 33
  14. 15
  15. 20
  16. 74
  17. 61
  18. 77
  19. 43
  20. 35
  21. 78
  22. 87
  23. 70
  24. 55
  25. 86
  26. 47
  27. 67
  28. 88
  29. 9
  30. 89
  31. 59
  32. 27
  33. 22
  34. 12
  35. 40
  36. 66
  37. 23
  38. 84
  39. 30
  40. 24

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