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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 140 · 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. 1.41² =
  2. 2.81² =
  3. 3.65² =
  4. 4.94² =
  5. 5.42² =
  6. 6.67² =
  7. 7.87² =
  8. 8.73² =
  9. 9.61² =
  10. 10.93² =
  11. 11.48² =
  12. 12.34² =
  13. 13.68² =
  14. 14.51² =
  15. 15.82² =
  16. 16.89² =
  17. 17.37² =
  18. 18.45² =
  19. 19.32² =
  20. 20.44² =
  21. 21.91² =
  22. 22.86² =
  23. 23.76² =
  24. 24.85² =
  25. 25.55² =
  26. 26.47² =
  27. 27.43² =
  28. 28.36² =
  29. 29.39² =
  30. 30.78² =
  31. 31.98² =
  32. 32.31² =
  33. 33.46² =
  34. 34.75² =
  35. 35.84² =
  36. 36.96² =
  37. 37.99² =
  38. 38.52² =
  39. 39.57² =
  40. 40.38² =

Answer key

  1. 1681
  2. 6561
  3. 4225
  4. 8836
  5. 1764
  6. 4489
  7. 7569
  8. 5329
  9. 3721
  10. 8649
  11. 2304
  12. 1156
  13. 4624
  14. 2601
  15. 6724
  16. 7921
  17. 1369
  18. 2025
  19. 1024
  20. 1936
  21. 8281
  22. 7396
  23. 5776
  24. 7225
  25. 3025
  26. 2209
  27. 1849
  28. 1296
  29. 1521
  30. 6084
  31. 9604
  32. 961
  33. 2116
  34. 5625
  35. 7056
  36. 9216
  37. 9801
  38. 2704
  39. 3249
  40. 1444

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