← 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 524 · 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. 1.41² =
  2. 2.31² =
  3. 3.46² =
  4. 4.47² =
  5. 5.69² =
  6. 6.71² =
  7. 7.96² =
  8. 8.55² =
  9. 9.42² =
  10. 10.99² =
  11. 11.79² =
  12. 12.65² =
  13. 13.48² =
  14. 14.56² =
  15. 15.72² =
  16. 16.83² =
  17. 17.58² =
  18. 18.85² =
  19. 19.43² =
  20. 20.94² =
  21. 21.92² =
  22. 22.44² =
  23. 23.91² =
  24. 24.49² =
  25. 25.97² =
  26. 26.66² =
  27. 27.89² =
  28. 28.82² =
  29. 29.45² =
  30. 30.88² =
  31. 31.53² =
  32. 32.38² =
  33. 33.95² =
  34. 34.81² =
  35. 35.34² =
  36. 36.32² =
  37. 37.93² =
  38. 38.52² =
  39. 39.77² =
  40. 40.37² =

Answer key

  1. 1681
  2. 961
  3. 2116
  4. 2209
  5. 4761
  6. 5041
  7. 9216
  8. 3025
  9. 1764
  10. 9801
  11. 6241
  12. 4225
  13. 2304
  14. 3136
  15. 5184
  16. 6889
  17. 3364
  18. 7225
  19. 1849
  20. 8836
  21. 8464
  22. 1936
  23. 8281
  24. 2401
  25. 9409
  26. 4356
  27. 7921
  28. 6724
  29. 2025
  30. 7744
  31. 2809
  32. 1444
  33. 9025
  34. 6561
  35. 1156
  36. 1024
  37. 8649
  38. 2704
  39. 5929
  40. 1369

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