← 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 268 · 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. 2.81² =
  3. 3.58² =
  4. 4.53² =
  5. 5.97² =
  6. 6.64² =
  7. 7.66² =
  8. 8.73² =
  9. 9.98² =
  10. 10.87² =
  11. 11.61² =
  12. 12.69² =
  13. 13.75² =
  14. 14.85² =
  15. 15.65² =
  16. 16.89² =
  17. 17.63² =
  18. 18.79² =
  19. 19.42² =
  20. 20.44² =
  21. 21.52² =
  22. 22.32² =
  23. 23.77² =
  24. 24.49² =
  25. 25.96² =
  26. 26.84² =
  27. 27.71² =
  28. 28.86² =
  29. 29.93² =
  30. 30.91² =
  31. 31.34² =
  32. 32.48² =
  33. 33.74² =
  34. 34.95² =
  35. 35.38² =
  36. 36.54² =
  37. 37.57² =
  38. 38.62² =
  39. 39.78² =
  40. 40.46² =

Answer key

  1. 2601
  2. 6561
  3. 3364
  4. 2809
  5. 9409
  6. 4096
  7. 4356
  8. 5329
  9. 9604
  10. 7569
  11. 3721
  12. 4761
  13. 5625
  14. 7225
  15. 4225
  16. 7921
  17. 3969
  18. 6241
  19. 1764
  20. 1936
  21. 2704
  22. 1024
  23. 5929
  24. 2401
  25. 9216
  26. 7056
  27. 5041
  28. 7396
  29. 8649
  30. 8281
  31. 1156
  32. 2304
  33. 5476
  34. 9025
  35. 1444
  36. 2916
  37. 3249
  38. 3844
  39. 6084
  40. 2116

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