← 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 656 · 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. 1.88² =
  2. 2.71² =
  3. 3.51² =
  4. 4.76² =
  5. 5.79² =
  6. 6.64² =
  7. 7.32² =
  8. 8.48² =
  9. 9.72² =
  10. 10.39² =
  11. 11.34² =
  12. 12.41² =
  13. 13.67² =
  14. 14.92² =
  15. 15.57² =
  16. 16.35² =
  17. 17.75² =
  18. 18.98² =
  19. 19.63² =
  20. 20.44² =
  21. 21.83² =
  22. 22.97² =
  23. 23.55² =
  24. 24.77² =
  25. 25.36² =
  26. 26.37² =
  27. 27.58² =
  28. 28.87² =
  29. 29.96² =
  30. 30.56² =
  31. 31.31² =
  32. 32.84² =
  33. 33.32² =
  34. 34.46² =
  35. 35.33² =
  36. 36.42² =
  37. 37.38² =
  38. 38.52² =
  39. 39.73² =
  40. 40.91² =

Answer key

  1. 7744
  2. 5041
  3. 2601
  4. 5776
  5. 6241
  6. 4096
  7. 1024
  8. 2304
  9. 5184
  10. 1521
  11. 1156
  12. 1681
  13. 4489
  14. 8464
  15. 3249
  16. 1225
  17. 5625
  18. 9604
  19. 3969
  20. 1936
  21. 6889
  22. 9409
  23. 3025
  24. 5929
  25. 1296
  26. 1369
  27. 3364
  28. 7569
  29. 9216
  30. 3136
  31. 961
  32. 7056
  33. 1024
  34. 2116
  35. 1089
  36. 1764
  37. 1444
  38. 2704
  39. 5329
  40. 8281

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