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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 589 · 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. 1.53² =
  2. 2.68² =
  3. 3.63² =
  4. 4.43² =
  5. 5.39² =
  6. 6.89² =
  7. 7.76² =
  8. 8.71² =
  9. 9.44² =
  10. 10.54² =
  11. 11.78² =
  12. 12.83² =
  13. 13.55² =
  14. 14.36² =
  15. 15.56² =
  16. 16.58² =
  17. 17.65² =
  18. 18.61² =
  19. 19.91² =
  20. 20.47² =
  21. 21.93² =
  22. 22.45² =
  23. 23.84² =
  24. 24.72² =
  25. 25.86² =
  26. 26.74² =
  27. 27.37² =
  28. 28.57² =
  29. 29.41² =
  30. 30.79² =
  31. 31.77² =
  32. 32.42² =
  33. 33.99² =
  34. 34.34² =
  35. 35.49² =
  36. 36.48² =
  37. 37.38² =
  38. 38.75² =
  39. 39.82² =
  40. 40.66² =

Answer key

  1. 2809
  2. 4624
  3. 3969
  4. 1849
  5. 1521
  6. 7921
  7. 5776
  8. 5041
  9. 1936
  10. 2916
  11. 6084
  12. 6889
  13. 3025
  14. 1296
  15. 3136
  16. 3364
  17. 4225
  18. 3721
  19. 8281
  20. 2209
  21. 8649
  22. 2025
  23. 7056
  24. 5184
  25. 7396
  26. 5476
  27. 1369
  28. 3249
  29. 1681
  30. 6241
  31. 5929
  32. 1764
  33. 9801
  34. 1156
  35. 2401
  36. 2304
  37. 1444
  38. 5625
  39. 6724
  40. 4356

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