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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 688 · 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. 1.34² =
  2. 2.41² =
  3. 3.31² =
  4. 4.51² =
  5. 5.58² =
  6. 6.95² =
  7. 7.69² =
  8. 8.61² =
  9. 9.53² =
  10. 10.64² =
  11. 11.59² =
  12. 12.37² =
  13. 13.55² =
  14. 14.47² =
  15. 15.39² =
  16. 16.42² =
  17. 17.73² =
  18. 18.65² =
  19. 19.56² =
  20. 20.89² =
  21. 21.93² =
  22. 22.96² =
  23. 23.85² =
  24. 24.63² =
  25. 25.38² =
  26. 26.54² =
  27. 27.32² =
  28. 28.52² =
  29. 29.87² =
  30. 30.48² =
  31. 31.67² =
  32. 32.72² =
  33. 33.68² =
  34. 34.92² =
  35. 35.84² =
  36. 36.91² =
  37. 37.99² =
  38. 38.43² =
  39. 39.49² =
  40. 40.44² =

Answer key

  1. 1156
  2. 1681
  3. 961
  4. 2601
  5. 3364
  6. 9025
  7. 4761
  8. 3721
  9. 2809
  10. 4096
  11. 3481
  12. 1369
  13. 3025
  14. 2209
  15. 1521
  16. 1764
  17. 5329
  18. 4225
  19. 3136
  20. 7921
  21. 8649
  22. 9216
  23. 7225
  24. 3969
  25. 1444
  26. 2916
  27. 1024
  28. 2704
  29. 7569
  30. 2304
  31. 4489
  32. 5184
  33. 4624
  34. 8464
  35. 7056
  36. 8281
  37. 9801
  38. 1849
  39. 2401
  40. 1936

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