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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 870 · 40 questions
TalentJR

How to do it in your head (Tens first): Keep the first number as it is. Add the tens of the second number. Add the ones.

NameDateTime takenScore ___ / 40
  1. 1.70 + 58 =
  2. 2.86 + 73 =
  3. 3.53 + 34 =
  4. 4.63 + 57 =
  5. 5.30 + 77 =
  6. 6.28 + 26 =
  7. 7.45 + 27 =
  8. 8.52 + 26 =
  9. 9.84 + 61 =
  10. 10.45 + 89 =
  11. 11.87 + 24 =
  12. 12.31 + 19 =
  13. 13.21 + 64 =
  14. 14.64 + 88 =
  15. 15.81 + 16 =
  16. 16.48 + 18 =
  17. 17.61 + 29 =
  18. 18.36 + 65 =
  19. 19.81 + 63 =
  20. 20.53 + 24 =
  21. 21.30 + 61 =
  22. 22.75 + 77 =
  23. 23.28 + 35 =
  24. 24.55 + 16 =
  25. 25.40 + 74 =
  26. 26.41 + 16 =
  27. 27.65 + 21 =
  28. 28.72 + 38 =
  29. 29.79 + 28 =
  30. 30.36 + 14 =
  31. 31.49 + 63 =
  32. 32.52 + 22 =
  33. 33.26 + 65 =
  34. 34.29 + 48 =
  35. 35.38 + 18 =
  36. 36.62 + 76 =
  37. 37.76 + 42 =
  38. 38.77 + 37 =
  39. 39.70 + 86 =
  40. 40.77 + 28 =

Answer key

  1. 128
  2. 159
  3. 87
  4. 120
  5. 107
  6. 54
  7. 72
  8. 78
  9. 145
  10. 134
  11. 111
  12. 50
  13. 85
  14. 152
  15. 97
  16. 66
  17. 90
  18. 101
  19. 144
  20. 77
  21. 91
  22. 152
  23. 63
  24. 71
  25. 114
  26. 57
  27. 86
  28. 110
  29. 107
  30. 50
  31. 112
  32. 74
  33. 91
  34. 77
  35. 56
  36. 138
  37. 118
  38. 114
  39. 156
  40. 105

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