← 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 211 · 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. 1.51² =
  2. 2.42² =
  3. 3.35² =
  4. 4.82² =
  5. 5.63² =
  6. 6.33² =
  7. 7.98² =
  8. 8.34² =
  9. 9.39² =
  10. 10.31² =
  11. 11.86² =
  12. 12.67² =
  13. 13.76² =
  14. 14.54² =
  15. 15.38² =
  16. 16.44² =
  17. 17.45² =
  18. 18.74² =
  19. 19.59² =
  20. 20.36² =
  21. 21.78² =
  22. 22.92² =
  23. 23.56² =
  24. 24.85² =
  25. 25.88² =
  26. 26.32² =
  27. 27.68² =
  28. 28.47² =
  29. 29.77² =
  30. 30.52² =
  31. 31.96² =
  32. 32.61² =
  33. 33.49² =
  34. 34.99² =
  35. 35.97² =
  36. 36.71² =
  37. 37.64² =
  38. 38.46² =
  39. 39.94² =
  40. 40.62² =

Answer key

  1. 2601
  2. 1764
  3. 1225
  4. 6724
  5. 3969
  6. 1089
  7. 9604
  8. 1156
  9. 1521
  10. 961
  11. 7396
  12. 4489
  13. 5776
  14. 2916
  15. 1444
  16. 1936
  17. 2025
  18. 5476
  19. 3481
  20. 1296
  21. 6084
  22. 8464
  23. 3136
  24. 7225
  25. 7744
  26. 1024
  27. 4624
  28. 2209
  29. 5929
  30. 2704
  31. 9216
  32. 3721
  33. 2401
  34. 9801
  35. 9409
  36. 5041
  37. 4096
  38. 2116
  39. 8836
  40. 3844

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