← 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 1 · 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. 1.51² =
  2. 2.93² =
  3. 3.41² =
  4. 4.73² =
  5. 5.69² =
  6. 6.68² =
  7. 7.34² =
  8. 8.55² =
  9. 9.35² =
  10. 10.33² =
  11. 11.76² =
  12. 12.63² =
  13. 13.61² =
  14. 14.43² =
  15. 15.91² =
  16. 16.39² =
  17. 17.96² =
  18. 18.99² =
  19. 19.84² =
  20. 20.67² =
  21. 21.89² =
  22. 22.54² =
  23. 23.94² =
  24. 24.78² =
  25. 25.86² =
  26. 26.65² =
  27. 27.44² =
  28. 28.85² =
  29. 29.64² =
  30. 30.56² =
  31. 31.58² =
  32. 32.32² =
  33. 33.62² =
  34. 34.98² =
  35. 35.71² =
  36. 36.36² =
  37. 37.48² =
  38. 38.31² =
  39. 39.66² =
  40. 40.92² =

Answer key

  1. 2601
  2. 8649
  3. 1681
  4. 5329
  5. 4761
  6. 4624
  7. 1156
  8. 3025
  9. 1225
  10. 1089
  11. 5776
  12. 3969
  13. 3721
  14. 1849
  15. 8281
  16. 1521
  17. 9216
  18. 9801
  19. 7056
  20. 4489
  21. 7921
  22. 2916
  23. 8836
  24. 6084
  25. 7396
  26. 4225
  27. 1936
  28. 7225
  29. 4096
  30. 3136
  31. 3364
  32. 1024
  33. 3844
  34. 9604
  35. 5041
  36. 1296
  37. 2304
  38. 961
  39. 4356
  40. 8464

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