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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 492 · 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. 2.3 + ? = 10
  3. 3.50 + ? = 100
  4. 4.11 + ? = 100
  5. 5.5 + ? = 10
  6. 6.57 + ? = 100
  7. 7.7 + ? = 10
  8. 8.4 + ? = 10
  9. 9.1 + ? = 10
  10. 10.6 + ? = 10
  11. 11.45 + ? = 100
  12. 12.62 + ? = 100
  13. 13.13 + ? = 100
  14. 14.21 + ? = 100
  15. 15.22 + ? = 100
  16. 16.25 + ? = 100
  17. 17.44 + ? = 100
  18. 18.15 + ? = 100
  19. 19.9 + ? = 10
  20. 20.54 + ? = 100
  21. 21.27 + ? = 100
  22. 22.66 + ? = 100
  23. 23.19 + ? = 100
  24. 24.65 + ? = 100
  25. 25.88 + ? = 100
  26. 26.8 + ? = 10
  27. 27.42 + ? = 100
  28. 28.52 + ? = 100
  29. 29.56 + ? = 100
  30. 30.36 + ? = 100
  31. 31.58 + ? = 100
  32. 32.49 + ? = 100
  33. 33.34 + ? = 100
  34. 34.38 + ? = 100
  35. 35.77 + ? = 100
  36. 36.64 + ? = 100
  37. 37.76 + ? = 100
  38. 38.80 + ? = 100
  39. 39.12 + ? = 100
  40. 40.47 + ? = 100

Answer key

  1. 8
  2. 7
  3. 50
  4. 89
  5. 5
  6. 43
  7. 3
  8. 6
  9. 9
  10. 4
  11. 55
  12. 38
  13. 87
  14. 79
  15. 78
  16. 75
  17. 56
  18. 85
  19. 1
  20. 46
  21. 73
  22. 34
  23. 81
  24. 35
  25. 12
  26. 2
  27. 58
  28. 48
  29. 44
  30. 64
  31. 42
  32. 51
  33. 66
  34. 62
  35. 23
  36. 36
  37. 24
  38. 20
  39. 88
  40. 53

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