← 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 555 · 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. 1.75² =
  2. 2.34² =
  3. 3.39² =
  4. 4.71² =
  5. 5.46² =
  6. 6.94² =
  7. 7.63² =
  8. 8.61² =
  9. 9.93² =
  10. 10.64² =
  11. 11.44² =
  12. 12.38² =
  13. 13.67² =
  14. 14.79² =
  15. 15.35² =
  16. 16.96² =
  17. 17.88² =
  18. 18.85² =
  19. 19.73² =
  20. 20.81² =
  21. 21.43² =
  22. 22.99² =
  23. 23.91² =
  24. 24.47² =
  25. 25.53² =
  26. 26.84² =
  27. 27.37² =
  28. 28.31² =
  29. 29.48² =
  30. 30.41² =
  31. 31.51² =
  32. 32.49² =
  33. 33.54² =
  34. 34.78² =
  35. 35.92² =
  36. 36.36² =
  37. 37.95² =
  38. 38.97² =
  39. 39.87² =
  40. 40.65² =

Answer key

  1. 5625
  2. 1156
  3. 1521
  4. 5041
  5. 2116
  6. 8836
  7. 3969
  8. 3721
  9. 8649
  10. 4096
  11. 1936
  12. 1444
  13. 4489
  14. 6241
  15. 1225
  16. 9216
  17. 7744
  18. 7225
  19. 5329
  20. 6561
  21. 1849
  22. 9801
  23. 8281
  24. 2209
  25. 2809
  26. 7056
  27. 1369
  28. 961
  29. 2304
  30. 1681
  31. 2601
  32. 2401
  33. 2916
  34. 6084
  35. 8464
  36. 1296
  37. 9025
  38. 9409
  39. 7569
  40. 4225

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