← 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 61 · 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. 1.96² =
  2. 2.71² =
  3. 3.46² =
  4. 4.31² =
  5. 5.68² =
  6. 6.69² =
  7. 7.75² =
  8. 8.42² =
  9. 9.52² =
  10. 10.79² =
  11. 11.58² =
  12. 12.64² =
  13. 13.93² =
  14. 14.99² =
  15. 15.65² =
  16. 16.35² =
  17. 17.57² =
  18. 18.95² =
  19. 19.73² =
  20. 20.86² =
  21. 21.41² =
  22. 22.77² =
  23. 23.97² =
  24. 24.76² =
  25. 25.45² =
  26. 26.51² =
  27. 27.47² =
  28. 28.32² =
  29. 29.91² =
  30. 30.74² =
  31. 31.98² =
  32. 32.81² =
  33. 33.63² =
  34. 34.54² =
  35. 35.66² =
  36. 36.37² =
  37. 37.82² =
  38. 38.61² =
  39. 39.62² =
  40. 40.43² =

Answer key

  1. 9216
  2. 5041
  3. 2116
  4. 961
  5. 4624
  6. 4761
  7. 5625
  8. 1764
  9. 2704
  10. 6241
  11. 3364
  12. 4096
  13. 8649
  14. 9801
  15. 4225
  16. 1225
  17. 3249
  18. 9025
  19. 5329
  20. 7396
  21. 1681
  22. 5929
  23. 9409
  24. 5776
  25. 2025
  26. 2601
  27. 2209
  28. 1024
  29. 8281
  30. 5476
  31. 9604
  32. 6561
  33. 3969
  34. 2916
  35. 4356
  36. 1369
  37. 6724
  38. 3721
  39. 3844
  40. 1849

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