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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 47 · 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. 1.47 + ? = 100
  2. 2.3 + ? = 10
  3. 3.7 + ? = 10
  4. 4.61 + ? = 100
  5. 5.76 + ? = 100
  6. 6.81 + ? = 100
  7. 7.74 + ? = 100
  8. 8.19 + ? = 100
  9. 9.21 + ? = 100
  10. 10.5 + ? = 10
  11. 11.8 + ? = 10
  12. 12.60 + ? = 100
  13. 13.9 + ? = 10
  14. 14.49 + ? = 100
  15. 15.64 + ? = 100
  16. 16.85 + ? = 100
  17. 17.6 + ? = 10
  18. 18.2 + ? = 10
  19. 19.43 + ? = 100
  20. 20.37 + ? = 100
  21. 21.45 + ? = 100
  22. 22.4 + ? = 10
  23. 23.23 + ? = 100
  24. 24.11 + ? = 100
  25. 25.67 + ? = 100
  26. 26.72 + ? = 100
  27. 27.27 + ? = 100
  28. 28.28 + ? = 100
  29. 29.80 + ? = 100
  30. 30.1 + ? = 10
  31. 31.77 + ? = 100
  32. 32.52 + ? = 100
  33. 33.54 + ? = 100
  34. 34.87 + ? = 100
  35. 35.88 + ? = 100
  36. 36.16 + ? = 100
  37. 37.34 + ? = 100
  38. 38.89 + ? = 100
  39. 39.56 + ? = 100
  40. 40.35 + ? = 100

Answer key

  1. 53
  2. 7
  3. 3
  4. 39
  5. 24
  6. 19
  7. 26
  8. 81
  9. 79
  10. 5
  11. 2
  12. 40
  13. 1
  14. 51
  15. 36
  16. 15
  17. 4
  18. 8
  19. 57
  20. 63
  21. 55
  22. 6
  23. 77
  24. 89
  25. 33
  26. 28
  27. 73
  28. 72
  29. 20
  30. 9
  31. 23
  32. 48
  33. 46
  34. 13
  35. 12
  36. 84
  37. 66
  38. 11
  39. 44
  40. 65

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