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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 543 · 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. 1.52 + ? = 100
  2. 2.49 + ? = 100
  3. 3.6 + ? = 10
  4. 4.8 + ? = 10
  5. 5.88 + ? = 100
  6. 6.24 + ? = 100
  7. 7.69 + ? = 100
  8. 8.9 + ? = 10
  9. 9.4 + ? = 10
  10. 10.2 + ? = 10
  11. 11.16 + ? = 100
  12. 12.25 + ? = 100
  13. 13.45 + ? = 100
  14. 14.42 + ? = 100
  15. 15.18 + ? = 100
  16. 16.51 + ? = 100
  17. 17.56 + ? = 100
  18. 18.87 + ? = 100
  19. 19.34 + ? = 100
  20. 20.33 + ? = 100
  21. 21.41 + ? = 100
  22. 22.3 + ? = 10
  23. 23.22 + ? = 100
  24. 24.64 + ? = 100
  25. 25.7 + ? = 10
  26. 26.55 + ? = 100
  27. 27.80 + ? = 100
  28. 28.60 + ? = 100
  29. 29.30 + ? = 100
  30. 30.1 + ? = 10
  31. 31.36 + ? = 100
  32. 32.5 + ? = 10
  33. 33.37 + ? = 100
  34. 34.47 + ? = 100
  35. 35.19 + ? = 100
  36. 36.70 + ? = 100
  37. 37.11 + ? = 100
  38. 38.48 + ? = 100
  39. 39.20 + ? = 100
  40. 40.43 + ? = 100

Answer key

  1. 48
  2. 51
  3. 4
  4. 2
  5. 12
  6. 76
  7. 31
  8. 1
  9. 6
  10. 8
  11. 84
  12. 75
  13. 55
  14. 58
  15. 82
  16. 49
  17. 44
  18. 13
  19. 66
  20. 67
  21. 59
  22. 7
  23. 78
  24. 36
  25. 3
  26. 45
  27. 20
  28. 40
  29. 70
  30. 9
  31. 64
  32. 5
  33. 63
  34. 53
  35. 81
  36. 30
  37. 89
  38. 52
  39. 80
  40. 57

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