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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 110 · 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. 1.59² =
  2. 2.71² =
  3. 3.99² =
  4. 4.89² =
  5. 5.42² =
  6. 6.61² =
  7. 7.79² =
  8. 8.36² =
  9. 9.76² =
  10. 10.86² =
  11. 11.92² =
  12. 12.44² =
  13. 13.81² =
  14. 14.41² =
  15. 15.75² =
  16. 16.68² =
  17. 17.62² =
  18. 18.54² =
  19. 19.94² =
  20. 20.87² =
  21. 21.38² =
  22. 22.63² =
  23. 23.35² =
  24. 24.85² =
  25. 25.43² =
  26. 26.49² =
  27. 27.56² =
  28. 28.47² =
  29. 29.39² =
  30. 30.46² =
  31. 31.98² =
  32. 32.96² =
  33. 33.82² =
  34. 34.58² =
  35. 35.91² =
  36. 36.31² =
  37. 37.64² =
  38. 38.69² =
  39. 39.74² =
  40. 40.37² =

Answer key

  1. 3481
  2. 5041
  3. 9801
  4. 7921
  5. 1764
  6. 3721
  7. 6241
  8. 1296
  9. 5776
  10. 7396
  11. 8464
  12. 1936
  13. 6561
  14. 1681
  15. 5625
  16. 4624
  17. 3844
  18. 2916
  19. 8836
  20. 7569
  21. 1444
  22. 3969
  23. 1225
  24. 7225
  25. 1849
  26. 2401
  27. 3136
  28. 2209
  29. 1521
  30. 2116
  31. 9604
  32. 9216
  33. 6724
  34. 3364
  35. 8281
  36. 961
  37. 4096
  38. 4761
  39. 5476
  40. 1369

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