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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 276 · 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. 1.63² =
  2. 2.51² =
  3. 3.49² =
  4. 4.41² =
  5. 5.75² =
  6. 6.39² =
  7. 7.43² =
  8. 8.95² =
  9. 9.68² =
  10. 10.66² =
  11. 11.72² =
  12. 12.59² =
  13. 13.52² =
  14. 14.78² =
  15. 15.81² =
  16. 16.58² =
  17. 17.44² =
  18. 18.85² =
  19. 19.61² =
  20. 20.82² =
  21. 21.35² =
  22. 22.89² =
  23. 23.79² =
  24. 24.38² =
  25. 25.73² =
  26. 26.37² =
  27. 27.34² =
  28. 28.56² =
  29. 29.33² =
  30. 30.46² =
  31. 31.62² =
  32. 32.74² =
  33. 33.36² =
  34. 34.91² =
  35. 35.31² =
  36. 36.87² =
  37. 37.99² =
  38. 38.98² =
  39. 39.42² =
  40. 40.86² =

Answer key

  1. 3969
  2. 2601
  3. 2401
  4. 1681
  5. 5625
  6. 1521
  7. 1849
  8. 9025
  9. 4624
  10. 4356
  11. 5184
  12. 3481
  13. 2704
  14. 6084
  15. 6561
  16. 3364
  17. 1936
  18. 7225
  19. 3721
  20. 6724
  21. 1225
  22. 7921
  23. 6241
  24. 1444
  25. 5329
  26. 1369
  27. 1156
  28. 3136
  29. 1089
  30. 2116
  31. 3844
  32. 5476
  33. 1296
  34. 8281
  35. 961
  36. 7569
  37. 9801
  38. 9604
  39. 1764
  40. 7396

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