← 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 150 · 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. 2.58² =
  3. 3.68² =
  4. 4.41² =
  5. 5.67² =
  6. 6.33² =
  7. 7.74² =
  8. 8.42² =
  9. 9.46² =
  10. 10.89² =
  11. 11.35² =
  12. 12.48² =
  13. 13.54² =
  14. 14.76² =
  15. 15.63² =
  16. 16.51² =
  17. 17.65² =
  18. 18.79² =
  19. 19.78² =
  20. 20.57² =
  21. 21.31² =
  22. 22.47² =
  23. 23.53² =
  24. 24.96² =
  25. 25.38² =
  26. 26.59² =
  27. 27.32² =
  28. 28.36² =
  29. 29.71² =
  30. 30.49² =
  31. 31.34² =
  32. 32.45² =
  33. 33.69² =
  34. 34.92² =
  35. 35.94² =
  36. 36.82² =
  37. 37.87² =
  38. 38.62² =
  39. 39.98² =
  40. 40.97² =

Answer key

  1. 3721
  2. 3364
  3. 4624
  4. 1681
  5. 4489
  6. 1089
  7. 5476
  8. 1764
  9. 2116
  10. 7921
  11. 1225
  12. 2304
  13. 2916
  14. 5776
  15. 3969
  16. 2601
  17. 4225
  18. 6241
  19. 6084
  20. 3249
  21. 961
  22. 2209
  23. 2809
  24. 9216
  25. 1444
  26. 3481
  27. 1024
  28. 1296
  29. 5041
  30. 2401
  31. 1156
  32. 2025
  33. 4761
  34. 8464
  35. 8836
  36. 6724
  37. 7569
  38. 3844
  39. 9604
  40. 9409

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