← 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 633 · 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. 1.82² =
  2. 2.54² =
  3. 3.47² =
  4. 4.91² =
  5. 5.85² =
  6. 6.37² =
  7. 7.71² =
  8. 8.92² =
  9. 9.42² =
  10. 10.65² =
  11. 11.55² =
  12. 12.64² =
  13. 13.35² =
  14. 14.34² =
  15. 15.72² =
  16. 16.83² =
  17. 17.44² =
  18. 18.51² =
  19. 19.45² =
  20. 20.31² =
  21. 21.56² =
  22. 22.39² =
  23. 23.32² =
  24. 24.78² =
  25. 25.68² =
  26. 26.81² =
  27. 27.79² =
  28. 28.41² =
  29. 29.53² =
  30. 30.96² =
  31. 31.66² =
  32. 32.84² =
  33. 33.48² =
  34. 34.36² =
  35. 35.89² =
  36. 36.77² =
  37. 37.74² =
  38. 38.46² =
  39. 39.38² =
  40. 40.63² =

Answer key

  1. 6724
  2. 2916
  3. 2209
  4. 8281
  5. 7225
  6. 1369
  7. 5041
  8. 8464
  9. 1764
  10. 4225
  11. 3025
  12. 4096
  13. 1225
  14. 1156
  15. 5184
  16. 6889
  17. 1936
  18. 2601
  19. 2025
  20. 961
  21. 3136
  22. 1521
  23. 1024
  24. 6084
  25. 4624
  26. 6561
  27. 6241
  28. 1681
  29. 2809
  30. 9216
  31. 4356
  32. 7056
  33. 2304
  34. 1296
  35. 7921
  36. 5929
  37. 5476
  38. 2116
  39. 1444
  40. 3969

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