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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 740 · 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. 1.32² =
  2. 2.42² =
  3. 3.73² =
  4. 4.63² =
  5. 5.51² =
  6. 6.47² =
  7. 7.68² =
  8. 8.98² =
  9. 9.69² =
  10. 10.85² =
  11. 11.86² =
  12. 12.84² =
  13. 13.75² =
  14. 14.33² =
  15. 15.65² =
  16. 16.35² =
  17. 17.46² =
  18. 18.52² =
  19. 19.38² =
  20. 20.39² =
  21. 21.41² =
  22. 22.89² =
  23. 23.91² =
  24. 24.48² =
  25. 25.34² =
  26. 26.79² =
  27. 27.62² =
  28. 28.36² =
  29. 29.92² =
  30. 30.67² =
  31. 31.81² =
  32. 32.96² =
  33. 33.61² =
  34. 34.83² =
  35. 35.87² =
  36. 36.93² =
  37. 37.37² =
  38. 38.43² =
  39. 39.74² =
  40. 40.58² =

Answer key

  1. 1024
  2. 1764
  3. 5329
  4. 3969
  5. 2601
  6. 2209
  7. 4624
  8. 9604
  9. 4761
  10. 7225
  11. 7396
  12. 7056
  13. 5625
  14. 1089
  15. 4225
  16. 1225
  17. 2116
  18. 2704
  19. 1444
  20. 1521
  21. 1681
  22. 7921
  23. 8281
  24. 2304
  25. 1156
  26. 6241
  27. 3844
  28. 1296
  29. 8464
  30. 4489
  31. 6561
  32. 9216
  33. 3721
  34. 6889
  35. 7569
  36. 8649
  37. 1369
  38. 1849
  39. 5476
  40. 3364

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