← 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 52 · 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. 1.88² =
  2. 2.51² =
  3. 3.48² =
  4. 4.98² =
  5. 5.75² =
  6. 6.85² =
  7. 7.49² =
  8. 8.45² =
  9. 9.73² =
  10. 10.37² =
  11. 11.92² =
  12. 12.74² =
  13. 13.69² =
  14. 14.43² =
  15. 15.96² =
  16. 16.42² =
  17. 17.41² =
  18. 18.91² =
  19. 19.47² =
  20. 20.31² =
  21. 21.63² =
  22. 22.54² =
  23. 23.55² =
  24. 24.95² =
  25. 25.44² =
  26. 26.65² =
  27. 27.61² =
  28. 28.76² =
  29. 29.83² =
  30. 30.32² =
  31. 31.39² =
  32. 32.99² =
  33. 33.71² =
  34. 34.77² =
  35. 35.35² =
  36. 36.72² =
  37. 37.86² =
  38. 38.62² =
  39. 39.46² =
  40. 40.38² =

Answer key

  1. 7744
  2. 2601
  3. 2304
  4. 9604
  5. 5625
  6. 7225
  7. 2401
  8. 2025
  9. 5329
  10. 1369
  11. 8464
  12. 5476
  13. 4761
  14. 1849
  15. 9216
  16. 1764
  17. 1681
  18. 8281
  19. 2209
  20. 961
  21. 3969
  22. 2916
  23. 3025
  24. 9025
  25. 1936
  26. 4225
  27. 3721
  28. 5776
  29. 6889
  30. 1024
  31. 1521
  32. 9801
  33. 5041
  34. 5929
  35. 1225
  36. 5184
  37. 7396
  38. 3844
  39. 2116
  40. 1444

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