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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 679 · 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. 1.97² =
  2. 2.75² =
  3. 3.34² =
  4. 4.71² =
  5. 5.32² =
  6. 6.38² =
  7. 7.48² =
  8. 8.42² =
  9. 9.53² =
  10. 10.94² =
  11. 11.83² =
  12. 12.43² =
  13. 13.31² =
  14. 14.39² =
  15. 15.62² =
  16. 16.64² =
  17. 17.57² =
  18. 18.47² =
  19. 19.52² =
  20. 20.44² =
  21. 21.45² =
  22. 22.91² =
  23. 23.99² =
  24. 24.61² =
  25. 25.74² =
  26. 26.56² =
  27. 27.36² =
  28. 28.37² =
  29. 29.88² =
  30. 30.84² =
  31. 31.95² =
  32. 32.41² =
  33. 33.54² =
  34. 34.72² =
  35. 35.49² =
  36. 36.77² =
  37. 37.86² =
  38. 38.76² =
  39. 39.66² =
  40. 40.98² =

Answer key

  1. 9409
  2. 5625
  3. 1156
  4. 5041
  5. 1024
  6. 1444
  7. 2304
  8. 1764
  9. 2809
  10. 8836
  11. 6889
  12. 1849
  13. 961
  14. 1521
  15. 3844
  16. 4096
  17. 3249
  18. 2209
  19. 2704
  20. 1936
  21. 2025
  22. 8281
  23. 9801
  24. 3721
  25. 5476
  26. 3136
  27. 1296
  28. 1369
  29. 7744
  30. 7056
  31. 9025
  32. 1681
  33. 2916
  34. 5184
  35. 2401
  36. 5929
  37. 7396
  38. 5776
  39. 4356
  40. 9604

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