← 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 894 · 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. 1.67² =
  2. 2.89² =
  3. 3.49² =
  4. 4.41² =
  5. 5.39² =
  6. 6.38² =
  7. 7.92² =
  8. 8.42² =
  9. 9.87² =
  10. 10.62² =
  11. 11.52² =
  12. 12.71² =
  13. 13.35² =
  14. 14.51² =
  15. 15.97² =
  16. 16.64² =
  17. 17.61² =
  18. 18.77² =
  19. 19.76² =
  20. 20.44² =
  21. 21.99² =
  22. 22.91² =
  23. 23.81² =
  24. 24.94² =
  25. 25.54² =
  26. 26.55² =
  27. 27.72² =
  28. 28.56² =
  29. 29.82² =
  30. 30.46² =
  31. 31.53² =
  32. 32.58² =
  33. 33.93² =
  34. 34.68² =
  35. 35.73² =
  36. 36.69² =
  37. 37.37² =
  38. 38.47² =
  39. 39.31² =
  40. 40.78² =

Answer key

  1. 4489
  2. 7921
  3. 2401
  4. 1681
  5. 1521
  6. 1444
  7. 8464
  8. 1764
  9. 7569
  10. 3844
  11. 2704
  12. 5041
  13. 1225
  14. 2601
  15. 9409
  16. 4096
  17. 3721
  18. 5929
  19. 5776
  20. 1936
  21. 9801
  22. 8281
  23. 6561
  24. 8836
  25. 2916
  26. 3025
  27. 5184
  28. 3136
  29. 6724
  30. 2116
  31. 2809
  32. 3364
  33. 8649
  34. 4624
  35. 5329
  36. 4761
  37. 1369
  38. 2209
  39. 961
  40. 6084

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