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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 414 · 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. 2.28 + ? = 100
  3. 3.9 + ? = 10
  4. 4.7 + ? = 10
  5. 5.4 + ? = 10
  6. 6.5 + ? = 10
  7. 7.54 + ? = 100
  8. 8.76 + ? = 100
  9. 9.62 + ? = 100
  10. 10.26 + ? = 100
  11. 11.2 + ? = 10
  12. 12.18 + ? = 100
  13. 13.25 + ? = 100
  14. 14.34 + ? = 100
  15. 15.70 + ? = 100
  16. 16.68 + ? = 100
  17. 17.3 + ? = 10
  18. 18.64 + ? = 100
  19. 19.23 + ? = 100
  20. 20.36 + ? = 100
  21. 21.27 + ? = 100
  22. 22.37 + ? = 100
  23. 23.74 + ? = 100
  24. 24.58 + ? = 100
  25. 25.53 + ? = 100
  26. 26.78 + ? = 100
  27. 27.1 + ? = 10
  28. 28.29 + ? = 100
  29. 29.12 + ? = 100
  30. 30.86 + ? = 100
  31. 31.75 + ? = 100
  32. 32.77 + ? = 100
  33. 33.16 + ? = 100
  34. 34.49 + ? = 100
  35. 35.17 + ? = 100
  36. 36.60 + ? = 100
  37. 37.19 + ? = 100
  38. 38.6 + ? = 10
  39. 39.41 + ? = 100
  40. 40.55 + ? = 100

Answer key

  1. 2
  2. 72
  3. 1
  4. 3
  5. 6
  6. 5
  7. 46
  8. 24
  9. 38
  10. 74
  11. 8
  12. 82
  13. 75
  14. 66
  15. 30
  16. 32
  17. 7
  18. 36
  19. 77
  20. 64
  21. 73
  22. 63
  23. 26
  24. 42
  25. 47
  26. 22
  27. 9
  28. 71
  29. 88
  30. 14
  31. 25
  32. 23
  33. 84
  34. 51
  35. 83
  36. 40
  37. 81
  38. 4
  39. 59
  40. 45

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