← 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 794 · 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. 2.48² =
  3. 3.95² =
  4. 4.76² =
  5. 5.71² =
  6. 6.64² =
  7. 7.91² =
  8. 8.61² =
  9. 9.41² =
  10. 10.74² =
  11. 11.42² =
  12. 12.87² =
  13. 13.94² =
  14. 14.38² =
  15. 15.65² =
  16. 16.89² =
  17. 17.68² =
  18. 18.55² =
  19. 19.62² =
  20. 20.67² =
  21. 21.77² =
  22. 22.32² =
  23. 23.31² =
  24. 24.93² =
  25. 25.98² =
  26. 26.35² =
  27. 27.33² =
  28. 28.45² =
  29. 29.56² =
  30. 30.78² =
  31. 31.44² =
  32. 32.59² =
  33. 33.37² =
  34. 34.47² =
  35. 35.39² =
  36. 36.86² =
  37. 37.66² =
  38. 38.73² =
  39. 39.63² =
  40. 40.81² =

Answer key

  1. 2601
  2. 2304
  3. 9025
  4. 5776
  5. 5041
  6. 4096
  7. 8281
  8. 3721
  9. 1681
  10. 5476
  11. 1764
  12. 7569
  13. 8836
  14. 1444
  15. 4225
  16. 7921
  17. 4624
  18. 3025
  19. 3844
  20. 4489
  21. 5929
  22. 1024
  23. 961
  24. 8649
  25. 9604
  26. 1225
  27. 1089
  28. 2025
  29. 3136
  30. 6084
  31. 1936
  32. 3481
  33. 1369
  34. 2209
  35. 1521
  36. 7396
  37. 4356
  38. 5329
  39. 3969
  40. 6561

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