← 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 914 · 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. 1.74² =
  2. 2.61² =
  3. 3.82² =
  4. 4.43² =
  5. 5.63² =
  6. 6.84² =
  7. 7.81² =
  8. 8.91² =
  9. 9.89² =
  10. 10.41² =
  11. 11.51² =
  12. 12.33² =
  13. 13.44² =
  14. 14.31² =
  15. 15.67² =
  16. 16.47² =
  17. 17.54² =
  18. 18.36² =
  19. 19.39² =
  20. 20.73² =
  21. 21.75² =
  22. 22.49² =
  23. 23.55² =
  24. 24.88² =
  25. 25.93² =
  26. 26.48² =
  27. 27.42² =
  28. 28.86² =
  29. 29.46² =
  30. 30.58² =
  31. 31.62² =
  32. 32.68² =
  33. 33.57² =
  34. 34.66² =
  35. 35.45² =
  36. 36.38² =
  37. 37.95² =
  38. 38.65² =
  39. 39.85² =
  40. 40.76² =

Answer key

  1. 5476
  2. 3721
  3. 6724
  4. 1849
  5. 3969
  6. 7056
  7. 6561
  8. 8281
  9. 7921
  10. 1681
  11. 2601
  12. 1089
  13. 1936
  14. 961
  15. 4489
  16. 2209
  17. 2916
  18. 1296
  19. 1521
  20. 5329
  21. 5625
  22. 2401
  23. 3025
  24. 7744
  25. 8649
  26. 2304
  27. 1764
  28. 7396
  29. 2116
  30. 3364
  31. 3844
  32. 4624
  33. 3249
  34. 4356
  35. 2025
  36. 1444
  37. 9025
  38. 4225
  39. 7225
  40. 5776

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