← 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 755 · 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. 1.49² =
  2. 2.97² =
  3. 3.47² =
  4. 4.73² =
  5. 5.36² =
  6. 6.91² =
  7. 7.81² =
  8. 8.84² =
  9. 9.37² =
  10. 10.64² =
  11. 11.78² =
  12. 12.41² =
  13. 13.92² =
  14. 14.89² =
  15. 15.35² =
  16. 16.38² =
  17. 17.51² =
  18. 18.43² =
  19. 19.88² =
  20. 20.42² =
  21. 21.46² =
  22. 22.69² =
  23. 23.57² =
  24. 24.61² =
  25. 25.77² =
  26. 26.62² =
  27. 27.44² =
  28. 28.85² =
  29. 29.98² =
  30. 30.31² =
  31. 31.76² =
  32. 32.56² =
  33. 33.71² =
  34. 34.39² =
  35. 35.95² =
  36. 36.68² =
  37. 37.34² =
  38. 38.63² =
  39. 39.48² =
  40. 40.65² =

Answer key

  1. 2401
  2. 9409
  3. 2209
  4. 5329
  5. 1296
  6. 8281
  7. 6561
  8. 7056
  9. 1369
  10. 4096
  11. 6084
  12. 1681
  13. 8464
  14. 7921
  15. 1225
  16. 1444
  17. 2601
  18. 1849
  19. 7744
  20. 1764
  21. 2116
  22. 4761
  23. 3249
  24. 3721
  25. 5929
  26. 3844
  27. 1936
  28. 7225
  29. 9604
  30. 961
  31. 5776
  32. 3136
  33. 5041
  34. 1521
  35. 9025
  36. 4624
  37. 1156
  38. 3969
  39. 2304
  40. 4225

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