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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 245 · 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. 1.36² =
  2. 2.51² =
  3. 3.63² =
  4. 4.85² =
  5. 5.99² =
  6. 6.35² =
  7. 7.91² =
  8. 8.57² =
  9. 9.52² =
  10. 10.34² =
  11. 11.74² =
  12. 12.48² =
  13. 13.44² =
  14. 14.49² =
  15. 15.71² =
  16. 16.38² =
  17. 17.54² =
  18. 18.87² =
  19. 19.46² =
  20. 20.39² =
  21. 21.98² =
  22. 22.92² =
  23. 23.61² =
  24. 24.69² =
  25. 25.41² =
  26. 26.89² =
  27. 27.64² =
  28. 28.73² =
  29. 29.72² =
  30. 30.81² =
  31. 31.83² =
  32. 32.93² =
  33. 33.97² =
  34. 34.33² =
  35. 35.53² =
  36. 36.47² =
  37. 37.76² =
  38. 38.65² =
  39. 39.96² =
  40. 40.41² =

Answer key

  1. 1296
  2. 2601
  3. 3969
  4. 7225
  5. 9801
  6. 1225
  7. 8281
  8. 3249
  9. 2704
  10. 1156
  11. 5476
  12. 2304
  13. 1936
  14. 2401
  15. 5041
  16. 1444
  17. 2916
  18. 7569
  19. 2116
  20. 1521
  21. 9604
  22. 8464
  23. 3721
  24. 4761
  25. 1681
  26. 7921
  27. 4096
  28. 5329
  29. 5184
  30. 6561
  31. 6889
  32. 8649
  33. 9409
  34. 1089
  35. 2809
  36. 2209
  37. 5776
  38. 4225
  39. 9216
  40. 1681

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