← 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 620 · 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. 1.68² =
  2. 2.41² =
  3. 3.51² =
  4. 4.55² =
  5. 5.48² =
  6. 6.57² =
  7. 7.78² =
  8. 8.36² =
  9. 9.34² =
  10. 10.44² =
  11. 11.72² =
  12. 12.59² =
  13. 13.46² =
  14. 14.99² =
  15. 15.65² =
  16. 16.86² =
  17. 17.69² =
  18. 18.56² =
  19. 19.94² =
  20. 20.58² =
  21. 21.47² =
  22. 22.91² =
  23. 23.54² =
  24. 24.53² =
  25. 25.87² =
  26. 26.49² =
  27. 27.93² =
  28. 28.96² =
  29. 29.45² =
  30. 30.64² =
  31. 31.71² =
  32. 32.98² =
  33. 33.77² =
  34. 34.84² =
  35. 35.61² =
  36. 36.62² =
  37. 37.76² =
  38. 38.97² =
  39. 39.89² =
  40. 40.42² =

Answer key

  1. 4624
  2. 1681
  3. 2601
  4. 3025
  5. 2304
  6. 3249
  7. 6084
  8. 1296
  9. 1156
  10. 1936
  11. 5184
  12. 3481
  13. 2116
  14. 9801
  15. 4225
  16. 7396
  17. 4761
  18. 3136
  19. 8836
  20. 3364
  21. 2209
  22. 8281
  23. 2916
  24. 2809
  25. 7569
  26. 2401
  27. 8649
  28. 9216
  29. 2025
  30. 4096
  31. 5041
  32. 9604
  33. 5929
  34. 7056
  35. 3721
  36. 3844
  37. 5776
  38. 9409
  39. 7921
  40. 1764

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