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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 632 · 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. 1.92² =
  2. 2.64² =
  3. 3.43² =
  4. 4.63² =
  5. 5.85² =
  6. 6.87² =
  7. 7.55² =
  8. 8.79² =
  9. 9.36² =
  10. 10.68² =
  11. 11.41² =
  12. 12.33² =
  13. 13.59² =
  14. 14.48² =
  15. 15.93² =
  16. 16.49² =
  17. 17.72² =
  18. 18.99² =
  19. 19.46² =
  20. 20.38² =
  21. 21.67² =
  22. 22.39² =
  23. 23.91² =
  24. 24.35² =
  25. 25.89² =
  26. 26.34² =
  27. 27.57² =
  28. 28.86² =
  29. 29.82² =
  30. 30.74² =
  31. 31.98² =
  32. 32.53² =
  33. 33.32² =
  34. 34.54² =
  35. 35.96² =
  36. 36.31² =
  37. 37.69² =
  38. 38.44² =
  39. 39.65² =
  40. 40.37² =

Answer key

  1. 8464
  2. 4096
  3. 1849
  4. 3969
  5. 7225
  6. 7569
  7. 3025
  8. 6241
  9. 1296
  10. 4624
  11. 1681
  12. 1089
  13. 3481
  14. 2304
  15. 8649
  16. 2401
  17. 5184
  18. 9801
  19. 2116
  20. 1444
  21. 4489
  22. 1521
  23. 8281
  24. 1225
  25. 7921
  26. 1156
  27. 3249
  28. 7396
  29. 6724
  30. 5476
  31. 9604
  32. 2809
  33. 1024
  34. 2916
  35. 9216
  36. 961
  37. 4761
  38. 1936
  39. 4225
  40. 1369

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