← 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 222 · 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. 1.98² =
  2. 2.95² =
  3. 3.91² =
  4. 4.76² =
  5. 5.57² =
  6. 6.63² =
  7. 7.36² =
  8. 8.58² =
  9. 9.94² =
  10. 10.74² =
  11. 11.39² =
  12. 12.51² =
  13. 13.88² =
  14. 14.83² =
  15. 15.92² =
  16. 16.97² =
  17. 17.87² =
  18. 18.86² =
  19. 19.82² =
  20. 20.43² =
  21. 21.75² =
  22. 22.61² =
  23. 23.93² =
  24. 24.69² =
  25. 25.42² =
  26. 26.32² =
  27. 27.73² =
  28. 28.81² =
  29. 29.71² =
  30. 30.45² =
  31. 31.35² =
  32. 32.46² =
  33. 33.31² =
  34. 34.67² =
  35. 35.41² =
  36. 36.49² =
  37. 37.37² =
  38. 38.59² =
  39. 39.66² =
  40. 40.56² =

Answer key

  1. 9604
  2. 9025
  3. 8281
  4. 5776
  5. 3249
  6. 3969
  7. 1296
  8. 3364
  9. 8836
  10. 5476
  11. 1521
  12. 2601
  13. 7744
  14. 6889
  15. 8464
  16. 9409
  17. 7569
  18. 7396
  19. 6724
  20. 1849
  21. 5625
  22. 3721
  23. 8649
  24. 4761
  25. 1764
  26. 1024
  27. 5329
  28. 6561
  29. 5041
  30. 2025
  31. 1225
  32. 2116
  33. 961
  34. 4489
  35. 1681
  36. 2401
  37. 1369
  38. 3481
  39. 4356
  40. 3136

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