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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 261 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.66² =
  2. 2.52² =
  3. 3.71² =
  4. 4.91² =
  5. 5.72² =
  6. 6.98² =
  7. 7.34² =
  8. 8.32² =
  9. 9.42² =
  10. 10.35² =
  11. 11.85² =
  12. 12.45² =
  13. 13.37² =
  14. 14.94² =
  15. 15.73² =
  16. 16.88² =
  17. 17.39² =
  18. 18.65² =
  19. 19.56² =
  20. 20.69² =
  21. 21.33² =
  22. 22.77² =
  23. 23.62² =
  24. 24.75² =
  25. 25.93² =
  26. 26.86² =
  27. 27.79² =
  28. 28.49² =
  29. 29.89² =
  30. 30.38² =
  31. 31.51² =
  32. 32.81² =
  33. 33.87² =
  34. 34.92² =
  35. 35.43² =
  36. 36.47² =
  37. 37.61² =
  38. 38.84² =
  39. 39.74² =
  40. 40.64² =

Answer key

  1. 4356
  2. 2704
  3. 5041
  4. 8281
  5. 5184
  6. 9604
  7. 1156
  8. 1024
  9. 1764
  10. 1225
  11. 7225
  12. 2025
  13. 1369
  14. 8836
  15. 5329
  16. 7744
  17. 1521
  18. 4225
  19. 3136
  20. 4761
  21. 1089
  22. 5929
  23. 3844
  24. 5625
  25. 8649
  26. 7396
  27. 6241
  28. 2401
  29. 7921
  30. 1444
  31. 2601
  32. 6561
  33. 7569
  34. 8464
  35. 1849
  36. 2209
  37. 3721
  38. 7056
  39. 5476
  40. 4096

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