← 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 388 · 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. 1.69² =
  2. 2.56² =
  3. 3.85² =
  4. 4.59² =
  5. 5.97² =
  6. 6.65² =
  7. 7.51² =
  8. 8.81² =
  9. 9.95² =
  10. 10.91² =
  11. 11.61² =
  12. 12.38² =
  13. 13.41² =
  14. 14.63² =
  15. 15.74² =
  16. 16.46² =
  17. 17.86² =
  18. 18.55² =
  19. 19.75² =
  20. 20.33² =
  21. 21.57² =
  22. 22.35² =
  23. 23.62² =
  24. 24.64² =
  25. 25.45² =
  26. 26.52² =
  27. 27.43² =
  28. 28.92² =
  29. 29.84² =
  30. 30.83² =
  31. 31.82² =
  32. 32.31² =
  33. 33.48² =
  34. 34.37² =
  35. 35.88² =
  36. 36.32² =
  37. 37.78² =
  38. 38.72² =
  39. 39.68² =
  40. 40.77² =

Answer key

  1. 4761
  2. 3136
  3. 7225
  4. 3481
  5. 9409
  6. 4225
  7. 2601
  8. 6561
  9. 9025
  10. 8281
  11. 3721
  12. 1444
  13. 1681
  14. 3969
  15. 5476
  16. 2116
  17. 7396
  18. 3025
  19. 5625
  20. 1089
  21. 3249
  22. 1225
  23. 3844
  24. 4096
  25. 2025
  26. 2704
  27. 1849
  28. 8464
  29. 7056
  30. 6889
  31. 6724
  32. 961
  33. 2304
  34. 1369
  35. 7744
  36. 1024
  37. 6084
  38. 5184
  39. 4624
  40. 5929

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