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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 383 · 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. 1.87² =
  2. 2.51² =
  3. 3.76² =
  4. 4.36² =
  5. 5.71² =
  6. 6.38² =
  7. 7.91² =
  8. 8.52² =
  9. 9.32² =
  10. 10.89² =
  11. 11.94² =
  12. 12.68² =
  13. 13.37² =
  14. 14.67² =
  15. 15.41² =
  16. 16.79² =
  17. 17.56² =
  18. 18.83² =
  19. 19.34² =
  20. 20.69² =
  21. 21.57² =
  22. 22.73² =
  23. 23.35² =
  24. 24.45² =
  25. 25.54² =
  26. 26.72² =
  27. 27.64² =
  28. 28.63² =
  29. 29.88² =
  30. 30.81² =
  31. 31.86² =
  32. 32.96² =
  33. 33.95² =
  34. 34.59² =
  35. 35.42² =
  36. 36.58² =
  37. 37.61² =
  38. 38.62² =
  39. 39.99² =
  40. 40.78² =

Answer key

  1. 7569
  2. 2601
  3. 5776
  4. 1296
  5. 5041
  6. 1444
  7. 8281
  8. 2704
  9. 1024
  10. 7921
  11. 8836
  12. 4624
  13. 1369
  14. 4489
  15. 1681
  16. 6241
  17. 3136
  18. 6889
  19. 1156
  20. 4761
  21. 3249
  22. 5329
  23. 1225
  24. 2025
  25. 2916
  26. 5184
  27. 4096
  28. 3969
  29. 7744
  30. 6561
  31. 7396
  32. 9216
  33. 9025
  34. 3481
  35. 1764
  36. 3364
  37. 3721
  38. 3844
  39. 9801
  40. 6084

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