← 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 326 · 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. 1.79² =
  2. 2.56² =
  3. 3.52² =
  4. 4.78² =
  5. 5.99² =
  6. 6.66² =
  7. 7.91² =
  8. 8.41² =
  9. 9.33² =
  10. 10.31² =
  11. 11.37² =
  12. 12.98² =
  13. 13.64² =
  14. 14.62² =
  15. 15.34² =
  16. 16.32² =
  17. 17.46² =
  18. 18.76² =
  19. 19.38² =
  20. 20.45² =
  21. 21.49² =
  22. 22.55² =
  23. 23.36² =
  24. 24.74² =
  25. 25.73² =
  26. 26.43² =
  27. 27.97² =
  28. 28.68² =
  29. 29.86² =
  30. 30.61² =
  31. 31.35² =
  32. 32.81² =
  33. 33.51² =
  34. 34.88² =
  35. 35.87² =
  36. 36.44² =
  37. 37.39² =
  38. 38.96² =
  39. 39.95² =
  40. 40.58² =

Answer key

  1. 6241
  2. 3136
  3. 2704
  4. 6084
  5. 9801
  6. 4356
  7. 8281
  8. 1681
  9. 1089
  10. 961
  11. 1369
  12. 9604
  13. 4096
  14. 3844
  15. 1156
  16. 1024
  17. 2116
  18. 5776
  19. 1444
  20. 2025
  21. 2401
  22. 3025
  23. 1296
  24. 5476
  25. 5329
  26. 1849
  27. 9409
  28. 4624
  29. 7396
  30. 3721
  31. 1225
  32. 6561
  33. 2601
  34. 7744
  35. 7569
  36. 1936
  37. 1521
  38. 9216
  39. 9025
  40. 3364

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