← 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 144 · 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. 1.79² =
  2. 2.77² =
  3. 3.74² =
  4. 4.89² =
  5. 5.64² =
  6. 6.91² =
  7. 7.36² =
  8. 8.75² =
  9. 9.68² =
  10. 10.31² =
  11. 11.71² =
  12. 12.85² =
  13. 13.57² =
  14. 14.92² =
  15. 15.61² =
  16. 16.78² =
  17. 17.45² =
  18. 18.41² =
  19. 19.97² =
  20. 20.95² =
  21. 21.86² =
  22. 22.88² =
  23. 23.93² =
  24. 24.43² =
  25. 25.44² =
  26. 26.42² =
  27. 27.82² =
  28. 28.72² =
  29. 29.32² =
  30. 30.67² =
  31. 31.65² =
  32. 32.81² =
  33. 33.52² =
  34. 34.76² =
  35. 35.46² =
  36. 36.98² =
  37. 37.62² =
  38. 38.35² =
  39. 39.53² =
  40. 40.73² =

Answer key

  1. 6241
  2. 5929
  3. 5476
  4. 7921
  5. 4096
  6. 8281
  7. 1296
  8. 5625
  9. 4624
  10. 961
  11. 5041
  12. 7225
  13. 3249
  14. 8464
  15. 3721
  16. 6084
  17. 2025
  18. 1681
  19. 9409
  20. 9025
  21. 7396
  22. 7744
  23. 8649
  24. 1849
  25. 1936
  26. 1764
  27. 6724
  28. 5184
  29. 1024
  30. 4489
  31. 4225
  32. 6561
  33. 2704
  34. 5776
  35. 2116
  36. 9604
  37. 3844
  38. 1225
  39. 2809
  40. 5329

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