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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 372 · 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. 1.41² =
  2. 2.39² =
  3. 3.42² =
  4. 4.38² =
  5. 5.61² =
  6. 6.46² =
  7. 7.32² =
  8. 8.43² =
  9. 9.84² =
  10. 10.93² =
  11. 11.86² =
  12. 12.35² =
  13. 13.81² =
  14. 14.89² =
  15. 15.71² =
  16. 16.37² =
  17. 17.75² =
  18. 18.67² =
  19. 19.73² =
  20. 20.95² =
  21. 21.56² =
  22. 22.68² =
  23. 23.97² =
  24. 24.53² =
  25. 25.88² =
  26. 26.66² =
  27. 27.78² =
  28. 28.91² =
  29. 29.87² =
  30. 30.74² =
  31. 31.96² =
  32. 32.48² =
  33. 33.77² =
  34. 34.83² =
  35. 35.34² =
  36. 36.57² =
  37. 37.65² =
  38. 38.99² =
  39. 39.63² =
  40. 40.59² =

Answer key

  1. 1681
  2. 1521
  3. 1764
  4. 1444
  5. 3721
  6. 2116
  7. 1024
  8. 1849
  9. 7056
  10. 8649
  11. 7396
  12. 1225
  13. 6561
  14. 7921
  15. 5041
  16. 1369
  17. 5625
  18. 4489
  19. 5329
  20. 9025
  21. 3136
  22. 4624
  23. 9409
  24. 2809
  25. 7744
  26. 4356
  27. 6084
  28. 8281
  29. 7569
  30. 5476
  31. 9216
  32. 2304
  33. 5929
  34. 6889
  35. 1156
  36. 3249
  37. 4225
  38. 9801
  39. 3969
  40. 3481

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