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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 775 · 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. 1.66² =
  2. 2.39² =
  3. 3.48² =
  4. 4.65² =
  5. 5.89² =
  6. 6.92² =
  7. 7.51² =
  8. 8.81² =
  9. 9.41² =
  10. 10.36² =
  11. 11.78² =
  12. 12.34² =
  13. 13.38² =
  14. 14.37² =
  15. 15.99² =
  16. 16.83² =
  17. 17.45² =
  18. 18.79² =
  19. 19.73² =
  20. 20.31² =
  21. 21.93² =
  22. 22.91² =
  23. 23.54² =
  24. 24.97² =
  25. 25.71² =
  26. 26.75² =
  27. 27.62² =
  28. 28.86² =
  29. 29.32² =
  30. 30.95² =
  31. 31.69² =
  32. 32.85² =
  33. 33.52² =
  34. 34.46² =
  35. 35.57² =
  36. 36.35² =
  37. 37.87² =
  38. 38.72² =
  39. 39.43² =
  40. 40.58² =

Answer key

  1. 4356
  2. 1521
  3. 2304
  4. 4225
  5. 7921
  6. 8464
  7. 2601
  8. 6561
  9. 1681
  10. 1296
  11. 6084
  12. 1156
  13. 1444
  14. 1369
  15. 9801
  16. 6889
  17. 2025
  18. 6241
  19. 5329
  20. 961
  21. 8649
  22. 8281
  23. 2916
  24. 9409
  25. 5041
  26. 5625
  27. 3844
  28. 7396
  29. 1024
  30. 9025
  31. 4761
  32. 7225
  33. 2704
  34. 2116
  35. 3249
  36. 1225
  37. 7569
  38. 5184
  39. 1849
  40. 3364

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