← 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 969 · 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. 1.34² =
  2. 2.51² =
  3. 3.38² =
  4. 4.35² =
  5. 5.87² =
  6. 6.73² =
  7. 7.81² =
  8. 8.36² =
  9. 9.78² =
  10. 10.59² =
  11. 11.63² =
  12. 12.48² =
  13. 13.46² =
  14. 14.43² =
  15. 15.75² =
  16. 16.76² =
  17. 17.54² =
  18. 18.37² =
  19. 19.95² =
  20. 20.53² =
  21. 21.94² =
  22. 22.68² =
  23. 23.44² =
  24. 24.33² =
  25. 25.82² =
  26. 26.65² =
  27. 27.47² =
  28. 28.77² =
  29. 29.31² =
  30. 30.93² =
  31. 31.62² =
  32. 32.42² =
  33. 33.89² =
  34. 34.96² =
  35. 35.99² =
  36. 36.66² =
  37. 37.88² =
  38. 38.98² =
  39. 39.86² =
  40. 40.71² =

Answer key

  1. 1156
  2. 2601
  3. 1444
  4. 1225
  5. 7569
  6. 5329
  7. 6561
  8. 1296
  9. 6084
  10. 3481
  11. 3969
  12. 2304
  13. 2116
  14. 1849
  15. 5625
  16. 5776
  17. 2916
  18. 1369
  19. 9025
  20. 2809
  21. 8836
  22. 4624
  23. 1936
  24. 1089
  25. 6724
  26. 4225
  27. 2209
  28. 5929
  29. 961
  30. 8649
  31. 3844
  32. 1764
  33. 7921
  34. 9216
  35. 9801
  36. 4356
  37. 7744
  38. 9604
  39. 7396
  40. 5041

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