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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 159 · 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. 1.2 + ? = 10
  2. 2.6 + ? = 10
  3. 3.61 + ? = 100
  4. 4.12 + ? = 100
  5. 5.89 + ? = 100
  6. 6.62 + ? = 100
  7. 7.1 + ? = 10
  8. 8.84 + ? = 100
  9. 9.88 + ? = 100
  10. 10.23 + ? = 100
  11. 11.50 + ? = 100
  12. 12.86 + ? = 100
  13. 13.40 + ? = 100
  14. 14.26 + ? = 100
  15. 15.9 + ? = 10
  16. 16.3 + ? = 10
  17. 17.63 + ? = 100
  18. 18.49 + ? = 100
  19. 19.4 + ? = 10
  20. 20.7 + ? = 10
  21. 21.73 + ? = 100
  22. 22.35 + ? = 100
  23. 23.15 + ? = 100
  24. 24.5 + ? = 10
  25. 25.8 + ? = 10
  26. 26.81 + ? = 100
  27. 27.46 + ? = 100
  28. 28.78 + ? = 100
  29. 29.21 + ? = 100
  30. 30.39 + ? = 100
  31. 31.54 + ? = 100
  32. 32.19 + ? = 100
  33. 33.55 + ? = 100
  34. 34.44 + ? = 100
  35. 35.74 + ? = 100
  36. 36.75 + ? = 100
  37. 37.52 + ? = 100
  38. 38.53 + ? = 100
  39. 39.22 + ? = 100
  40. 40.80 + ? = 100

Answer key

  1. 8
  2. 4
  3. 39
  4. 88
  5. 11
  6. 38
  7. 9
  8. 16
  9. 12
  10. 77
  11. 50
  12. 14
  13. 60
  14. 74
  15. 1
  16. 7
  17. 37
  18. 51
  19. 6
  20. 3
  21. 27
  22. 65
  23. 85
  24. 5
  25. 2
  26. 19
  27. 54
  28. 22
  29. 79
  30. 61
  31. 46
  32. 81
  33. 45
  34. 56
  35. 26
  36. 25
  37. 48
  38. 47
  39. 78
  40. 20

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