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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 485 · 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. 1.68² =
  2. 2.58² =
  3. 3.33² =
  4. 4.45² =
  5. 5.44² =
  6. 6.71² =
  7. 7.86² =
  8. 8.76² =
  9. 9.43² =
  10. 10.56² =
  11. 11.38² =
  12. 12.72² =
  13. 13.32² =
  14. 14.62² =
  15. 15.93² =
  16. 16.48² =
  17. 17.41² =
  18. 18.37² =
  19. 19.57² =
  20. 20.47² =
  21. 21.36² =
  22. 22.34² =
  23. 23.35² =
  24. 24.67² =
  25. 25.65² =
  26. 26.92² =
  27. 27.31² =
  28. 28.95² =
  29. 29.99² =
  30. 30.87² =
  31. 31.91² =
  32. 32.52² =
  33. 33.49² =
  34. 34.55² =
  35. 35.84² =
  36. 36.73² =
  37. 37.85² =
  38. 38.89² =
  39. 39.82² =
  40. 40.51² =

Answer key

  1. 4624
  2. 3364
  3. 1089
  4. 2025
  5. 1936
  6. 5041
  7. 7396
  8. 5776
  9. 1849
  10. 3136
  11. 1444
  12. 5184
  13. 1024
  14. 3844
  15. 8649
  16. 2304
  17. 1681
  18. 1369
  19. 3249
  20. 2209
  21. 1296
  22. 1156
  23. 1225
  24. 4489
  25. 4225
  26. 8464
  27. 961
  28. 9025
  29. 9801
  30. 7569
  31. 8281
  32. 2704
  33. 2401
  34. 3025
  35. 7056
  36. 5329
  37. 7225
  38. 7921
  39. 6724
  40. 2601

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