← 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 718 · 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. 1.78² =
  2. 2.71² =
  3. 3.99² =
  4. 4.94² =
  5. 5.88² =
  6. 6.79² =
  7. 7.87² =
  8. 8.54² =
  9. 9.57² =
  10. 10.91² =
  11. 11.74² =
  12. 12.51² =
  13. 13.86² =
  14. 14.81² =
  15. 15.64² =
  16. 16.62² =
  17. 17.42² =
  18. 18.53² =
  19. 19.38² =
  20. 20.41² =
  21. 21.61² =
  22. 22.45² =
  23. 23.89² =
  24. 24.31² =
  25. 25.67² =
  26. 26.76² =
  27. 27.36² =
  28. 28.85² =
  29. 29.98² =
  30. 30.55² =
  31. 31.58² =
  32. 32.34² =
  33. 33.47² =
  34. 34.95² =
  35. 35.44² =
  36. 36.35² =
  37. 37.63² =
  38. 38.69² =
  39. 39.32² =
  40. 40.83² =

Answer key

  1. 6084
  2. 5041
  3. 9801
  4. 8836
  5. 7744
  6. 6241
  7. 7569
  8. 2916
  9. 3249
  10. 8281
  11. 5476
  12. 2601
  13. 7396
  14. 6561
  15. 4096
  16. 3844
  17. 1764
  18. 2809
  19. 1444
  20. 1681
  21. 3721
  22. 2025
  23. 7921
  24. 961
  25. 4489
  26. 5776
  27. 1296
  28. 7225
  29. 9604
  30. 3025
  31. 3364
  32. 1156
  33. 2209
  34. 9025
  35. 1936
  36. 1225
  37. 3969
  38. 4761
  39. 1024
  40. 6889

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