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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 565 · 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. 1.38² =
  2. 2.77² =
  3. 3.94² =
  4. 4.43² =
  5. 5.55² =
  6. 6.39² =
  7. 7.67² =
  8. 8.31² =
  9. 9.92² =
  10. 10.42² =
  11. 11.51² =
  12. 12.59² =
  13. 13.97² =
  14. 14.99² =
  15. 15.37² =
  16. 16.45² =
  17. 17.98² =
  18. 18.44² =
  19. 19.46² =
  20. 20.64² =
  21. 21.93² =
  22. 22.36² =
  23. 23.65² =
  24. 24.81² =
  25. 25.54² =
  26. 26.41² =
  27. 27.57² =
  28. 28.91² =
  29. 29.71² =
  30. 30.72² =
  31. 31.62² =
  32. 32.47² =
  33. 33.96² =
  34. 34.89² =
  35. 35.68² =
  36. 36.51² =
  37. 37.75² =
  38. 38.85² =
  39. 39.78² =
  40. 40.87² =

Answer key

  1. 1444
  2. 5929
  3. 8836
  4. 1849
  5. 3025
  6. 1521
  7. 4489
  8. 961
  9. 8464
  10. 1764
  11. 2601
  12. 3481
  13. 9409
  14. 9801
  15. 1369
  16. 2025
  17. 9604
  18. 1936
  19. 2116
  20. 4096
  21. 8649
  22. 1296
  23. 4225
  24. 6561
  25. 2916
  26. 1681
  27. 3249
  28. 8281
  29. 5041
  30. 5184
  31. 3844
  32. 2209
  33. 9216
  34. 7921
  35. 4624
  36. 2601
  37. 5625
  38. 7225
  39. 6084
  40. 7569

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