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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 490 · 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. 2.39² =
  3. 3.54² =
  4. 4.69² =
  5. 5.87² =
  6. 6.63² =
  7. 7.73² =
  8. 8.99² =
  9. 9.47² =
  10. 10.91² =
  11. 11.82² =
  12. 12.94² =
  13. 13.89² =
  14. 14.49² =
  15. 15.71² =
  16. 16.85² =
  17. 17.52² =
  18. 18.55² =
  19. 19.86² =
  20. 20.34² =
  21. 21.67² =
  22. 22.48² =
  23. 23.41² =
  24. 24.58² =
  25. 25.61² =
  26. 26.65² =
  27. 27.78² =
  28. 28.35² =
  29. 29.92² =
  30. 30.77² =
  31. 31.68² =
  32. 32.44² =
  33. 33.42² =
  34. 34.96² =
  35. 35.56² =
  36. 36.64² =
  37. 37.33² =
  38. 38.81² =
  39. 39.57² =
  40. 40.95² =

Answer key

  1. 1024
  2. 1521
  3. 2916
  4. 4761
  5. 7569
  6. 3969
  7. 5329
  8. 9801
  9. 2209
  10. 8281
  11. 6724
  12. 8836
  13. 7921
  14. 2401
  15. 5041
  16. 7225
  17. 2704
  18. 3025
  19. 7396
  20. 1156
  21. 4489
  22. 2304
  23. 1681
  24. 3364
  25. 3721
  26. 4225
  27. 6084
  28. 1225
  29. 8464
  30. 5929
  31. 4624
  32. 1936
  33. 1764
  34. 9216
  35. 3136
  36. 4096
  37. 1089
  38. 6561
  39. 3249
  40. 9025

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