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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 236 · 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. 1.41² =
  2. 2.85² =
  3. 3.34² =
  4. 4.53² =
  5. 5.59² =
  6. 6.43² =
  7. 7.46² =
  8. 8.91² =
  9. 9.71² =
  10. 10.57² =
  11. 11.31² =
  12. 12.63² =
  13. 13.76² =
  14. 14.42² =
  15. 15.52² =
  16. 16.72² =
  17. 17.97² =
  18. 18.74² =
  19. 19.87² =
  20. 20.67² =
  21. 21.38² =
  22. 22.32² =
  23. 23.83² =
  24. 24.45² =
  25. 25.94² =
  26. 26.47² =
  27. 27.51² =
  28. 28.49² =
  29. 29.75² =
  30. 30.82² =
  31. 31.36² =
  32. 32.48² =
  33. 33.56² =
  34. 34.54² =
  35. 35.66² =
  36. 36.44² =
  37. 37.96² =
  38. 38.69² =
  39. 39.89² =
  40. 40.64² =

Answer key

  1. 1681
  2. 7225
  3. 1156
  4. 2809
  5. 3481
  6. 1849
  7. 2116
  8. 8281
  9. 5041
  10. 3249
  11. 961
  12. 3969
  13. 5776
  14. 1764
  15. 2704
  16. 5184
  17. 9409
  18. 5476
  19. 7569
  20. 4489
  21. 1444
  22. 1024
  23. 6889
  24. 2025
  25. 8836
  26. 2209
  27. 2601
  28. 2401
  29. 5625
  30. 6724
  31. 1296
  32. 2304
  33. 3136
  34. 2916
  35. 4356
  36. 1936
  37. 9216
  38. 4761
  39. 7921
  40. 4096

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