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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 235 · 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. 1.42² =
  2. 2.63² =
  3. 3.55² =
  4. 4.43² =
  5. 5.37² =
  6. 6.74² =
  7. 7.35² =
  8. 8.71² =
  9. 9.78² =
  10. 10.77² =
  11. 11.76² =
  12. 12.51² =
  13. 13.38² =
  14. 14.65² =
  15. 15.86² =
  16. 16.47² =
  17. 17.64² =
  18. 18.33² =
  19. 19.39² =
  20. 20.61² =
  21. 21.45² =
  22. 22.36² =
  23. 23.58² =
  24. 24.95² =
  25. 25.81² =
  26. 26.87² =
  27. 27.57² =
  28. 28.94² =
  29. 29.48² =
  30. 30.92² =
  31. 31.67² =
  32. 32.44² =
  33. 33.91² =
  34. 34.83² =
  35. 35.53² =
  36. 36.99² =
  37. 37.89² =
  38. 38.54² =
  39. 39.62² =
  40. 40.59² =

Answer key

  1. 1764
  2. 3969
  3. 3025
  4. 1849
  5. 1369
  6. 5476
  7. 1225
  8. 5041
  9. 6084
  10. 5929
  11. 5776
  12. 2601
  13. 1444
  14. 4225
  15. 7396
  16. 2209
  17. 4096
  18. 1089
  19. 1521
  20. 3721
  21. 2025
  22. 1296
  23. 3364
  24. 9025
  25. 6561
  26. 7569
  27. 3249
  28. 8836
  29. 2304
  30. 8464
  31. 4489
  32. 1936
  33. 8281
  34. 6889
  35. 2809
  36. 9801
  37. 7921
  38. 2916
  39. 3844
  40. 3481

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