← Square any 2-digit number: up and down lesson New set →

Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 354 · 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. 1.35² =
  2. 2.93² =
  3. 3.71² =
  4. 4.86² =
  5. 5.76² =
  6. 6.49² =
  7. 7.52² =
  8. 8.34² =
  9. 9.74² =
  10. 10.41² =
  11. 11.79² =
  12. 12.48² =
  13. 13.81² =
  14. 14.88² =
  15. 15.69² =
  16. 16.36² =
  17. 17.39² =
  18. 18.42² =
  19. 19.77² =
  20. 20.33² =
  21. 21.65² =
  22. 22.56² =
  23. 23.85² =
  24. 24.54² =
  25. 25.75² =
  26. 26.72² =
  27. 27.57² =
  28. 28.63² =
  29. 29.89² =
  30. 30.51² =
  31. 31.44² =
  32. 32.97² =
  33. 33.43² =
  34. 34.91² =
  35. 35.32² =
  36. 36.96² =
  37. 37.53² =
  38. 38.59² =
  39. 39.94² =
  40. 40.47² =

Answer key

  1. 1225
  2. 8649
  3. 5041
  4. 7396
  5. 5776
  6. 2401
  7. 2704
  8. 1156
  9. 5476
  10. 1681
  11. 6241
  12. 2304
  13. 6561
  14. 7744
  15. 4761
  16. 1296
  17. 1521
  18. 1764
  19. 5929
  20. 1089
  21. 4225
  22. 3136
  23. 7225
  24. 2916
  25. 5625
  26. 5184
  27. 3249
  28. 3969
  29. 7921
  30. 2601
  31. 1936
  32. 9409
  33. 1849
  34. 8281
  35. 1024
  36. 9216
  37. 2809
  38. 3481
  39. 8836
  40. 2209

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths