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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 474 · 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. 1.99² =
  2. 2.78² =
  3. 3.62² =
  4. 4.74² =
  5. 5.86² =
  6. 6.95² =
  7. 7.97² =
  8. 8.55² =
  9. 9.85² =
  10. 10.88² =
  11. 11.32² =
  12. 12.57² =
  13. 13.37² =
  14. 14.65² =
  15. 15.96² =
  16. 16.92² =
  17. 17.35² =
  18. 18.42² =
  19. 19.47² =
  20. 20.98² =
  21. 21.58² =
  22. 22.36² =
  23. 23.34² =
  24. 24.31² =
  25. 25.56² =
  26. 26.53² =
  27. 27.64² =
  28. 28.44² =
  29. 29.81² =
  30. 30.49² =
  31. 31.75² =
  32. 32.45² =
  33. 33.68² =
  34. 34.69² =
  35. 35.61² =
  36. 36.72² =
  37. 37.41² =
  38. 38.39² =
  39. 39.59² =
  40. 40.84² =

Answer key

  1. 9801
  2. 6084
  3. 3844
  4. 5476
  5. 7396
  6. 9025
  7. 9409
  8. 3025
  9. 7225
  10. 7744
  11. 1024
  12. 3249
  13. 1369
  14. 4225
  15. 9216
  16. 8464
  17. 1225
  18. 1764
  19. 2209
  20. 9604
  21. 3364
  22. 1296
  23. 1156
  24. 961
  25. 3136
  26. 2809
  27. 4096
  28. 1936
  29. 6561
  30. 2401
  31. 5625
  32. 2025
  33. 4624
  34. 4761
  35. 3721
  36. 5184
  37. 1681
  38. 1521
  39. 3481
  40. 7056

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