← 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 318 · 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. 1.85² =
  2. 2.75² =
  3. 3.42² =
  4. 4.37² =
  5. 5.69² =
  6. 6.63² =
  7. 7.31² =
  8. 8.47² =
  9. 9.46² =
  10. 10.71² =
  11. 11.88² =
  12. 12.59² =
  13. 13.35² =
  14. 14.97² =
  15. 15.65² =
  16. 16.36² =
  17. 17.62² =
  18. 18.39² =
  19. 19.44² =
  20. 20.94² =
  21. 21.51² =
  22. 22.81² =
  23. 23.45² =
  24. 24.43² =
  25. 25.54² =
  26. 26.61² =
  27. 27.33² =
  28. 28.66² =
  29. 29.82² =
  30. 30.64² =
  31. 31.89² =
  32. 32.48² =
  33. 33.49² =
  34. 34.86² =
  35. 35.38² =
  36. 36.92² =
  37. 37.56² =
  38. 38.72² =
  39. 39.73² =
  40. 40.98² =

Answer key

  1. 7225
  2. 5625
  3. 1764
  4. 1369
  5. 4761
  6. 3969
  7. 961
  8. 2209
  9. 2116
  10. 5041
  11. 7744
  12. 3481
  13. 1225
  14. 9409
  15. 4225
  16. 1296
  17. 3844
  18. 1521
  19. 1936
  20. 8836
  21. 2601
  22. 6561
  23. 2025
  24. 1849
  25. 2916
  26. 3721
  27. 1089
  28. 4356
  29. 6724
  30. 4096
  31. 7921
  32. 2304
  33. 2401
  34. 7396
  35. 1444
  36. 8464
  37. 3136
  38. 5184
  39. 5329
  40. 9604

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