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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 410 · 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. 1.79 + ? = 100
  2. 2.80 + ? = 100
  3. 3.1 + ? = 10
  4. 4.3 + ? = 10
  5. 5.17 + ? = 100
  6. 6.2 + ? = 10
  7. 7.21 + ? = 100
  8. 8.67 + ? = 100
  9. 9.69 + ? = 100
  10. 10.28 + ? = 100
  11. 11.24 + ? = 100
  12. 12.6 + ? = 10
  13. 13.4 + ? = 10
  14. 14.8 + ? = 10
  15. 15.30 + ? = 100
  16. 16.9 + ? = 10
  17. 17.20 + ? = 100
  18. 18.45 + ? = 100
  19. 19.68 + ? = 100
  20. 20.5 + ? = 10
  21. 21.25 + ? = 100
  22. 22.65 + ? = 100
  23. 23.66 + ? = 100
  24. 24.37 + ? = 100
  25. 25.19 + ? = 100
  26. 26.64 + ? = 100
  27. 27.33 + ? = 100
  28. 28.32 + ? = 100
  29. 29.14 + ? = 100
  30. 30.48 + ? = 100
  31. 31.70 + ? = 100
  32. 32.52 + ? = 100
  33. 33.7 + ? = 10
  34. 34.29 + ? = 100
  35. 35.63 + ? = 100
  36. 36.75 + ? = 100
  37. 37.44 + ? = 100
  38. 38.57 + ? = 100
  39. 39.74 + ? = 100
  40. 40.38 + ? = 100

Answer key

  1. 21
  2. 20
  3. 9
  4. 7
  5. 83
  6. 8
  7. 79
  8. 33
  9. 31
  10. 72
  11. 76
  12. 4
  13. 6
  14. 2
  15. 70
  16. 1
  17. 80
  18. 55
  19. 32
  20. 5
  21. 75
  22. 35
  23. 34
  24. 63
  25. 81
  26. 36
  27. 67
  28. 68
  29. 86
  30. 52
  31. 30
  32. 48
  33. 3
  34. 71
  35. 37
  36. 25
  37. 56
  38. 43
  39. 26
  40. 62

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