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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 300 · 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. 1.61 + ? = 100
  2. 2.9 + ? = 10
  3. 3.76 + ? = 100
  4. 4.1 + ? = 10
  5. 5.19 + ? = 100
  6. 6.86 + ? = 100
  7. 7.4 + ? = 10
  8. 8.44 + ? = 100
  9. 9.67 + ? = 100
  10. 10.5 + ? = 10
  11. 11.3 + ? = 10
  12. 12.34 + ? = 100
  13. 13.87 + ? = 100
  14. 14.2 + ? = 10
  15. 15.74 + ? = 100
  16. 16.33 + ? = 100
  17. 17.49 + ? = 100
  18. 18.7 + ? = 10
  19. 19.12 + ? = 100
  20. 20.83 + ? = 100
  21. 21.8 + ? = 10
  22. 22.41 + ? = 100
  23. 23.22 + ? = 100
  24. 24.24 + ? = 100
  25. 25.15 + ? = 100
  26. 26.32 + ? = 100
  27. 27.70 + ? = 100
  28. 28.29 + ? = 100
  29. 29.51 + ? = 100
  30. 30.27 + ? = 100
  31. 31.45 + ? = 100
  32. 32.14 + ? = 100
  33. 33.52 + ? = 100
  34. 34.6 + ? = 10
  35. 35.88 + ? = 100
  36. 36.54 + ? = 100
  37. 37.25 + ? = 100
  38. 38.48 + ? = 100
  39. 39.36 + ? = 100
  40. 40.50 + ? = 100

Answer key

  1. 39
  2. 1
  3. 24
  4. 9
  5. 81
  6. 14
  7. 6
  8. 56
  9. 33
  10. 5
  11. 7
  12. 66
  13. 13
  14. 8
  15. 26
  16. 67
  17. 51
  18. 3
  19. 88
  20. 17
  21. 2
  22. 59
  23. 78
  24. 76
  25. 85
  26. 68
  27. 30
  28. 71
  29. 49
  30. 73
  31. 55
  32. 86
  33. 48
  34. 4
  35. 12
  36. 46
  37. 75
  38. 52
  39. 64
  40. 50

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