← 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 165 · 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. 1.61² =
  2. 2.56² =
  3. 3.32² =
  4. 4.31² =
  5. 5.85² =
  6. 6.75² =
  7. 7.68² =
  8. 8.34² =
  9. 9.57² =
  10. 10.51² =
  11. 11.91² =
  12. 12.59² =
  13. 13.89² =
  14. 14.83² =
  15. 15.43² =
  16. 16.81² =
  17. 17.36² =
  18. 18.44² =
  19. 19.82² =
  20. 20.62² =
  21. 21.93² =
  22. 22.69² =
  23. 23.88² =
  24. 24.74² =
  25. 25.86² =
  26. 26.87² =
  27. 27.41² =
  28. 28.72² =
  29. 29.33² =
  30. 30.95² =
  31. 31.71² =
  32. 32.64² =
  33. 33.63² =
  34. 34.92² =
  35. 35.55² =
  36. 36.79² =
  37. 37.78² =
  38. 38.46² =
  39. 39.84² =
  40. 40.35² =

Answer key

  1. 3721
  2. 3136
  3. 1024
  4. 961
  5. 7225
  6. 5625
  7. 4624
  8. 1156
  9. 3249
  10. 2601
  11. 8281
  12. 3481
  13. 7921
  14. 6889
  15. 1849
  16. 6561
  17. 1296
  18. 1936
  19. 6724
  20. 3844
  21. 8649
  22. 4761
  23. 7744
  24. 5476
  25. 7396
  26. 7569
  27. 1681
  28. 5184
  29. 1089
  30. 9025
  31. 5041
  32. 4096
  33. 3969
  34. 8464
  35. 3025
  36. 6241
  37. 6084
  38. 2116
  39. 7056
  40. 1225

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