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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 296 · 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. 1.58² =
  2. 2.31² =
  3. 3.51² =
  4. 4.34² =
  5. 5.32² =
  6. 6.56² =
  7. 7.57² =
  8. 8.52² =
  9. 9.92² =
  10. 10.75² =
  11. 11.76² =
  12. 12.82² =
  13. 13.79² =
  14. 14.95² =
  15. 15.72² =
  16. 16.85² =
  17. 17.73² =
  18. 18.61² =
  19. 19.68² =
  20. 20.41² =
  21. 21.94² =
  22. 22.35² =
  23. 23.65² =
  24. 24.69² =
  25. 25.36² =
  26. 26.78² =
  27. 27.96² =
  28. 28.38² =
  29. 29.62² =
  30. 30.48² =
  31. 31.49² =
  32. 32.55² =
  33. 33.46² =
  34. 34.91² =
  35. 35.86² =
  36. 36.37² =
  37. 37.71² =
  38. 38.83² =
  39. 39.44² =
  40. 40.53² =

Answer key

  1. 3364
  2. 961
  3. 2601
  4. 1156
  5. 1024
  6. 3136
  7. 3249
  8. 2704
  9. 8464
  10. 5625
  11. 5776
  12. 6724
  13. 6241
  14. 9025
  15. 5184
  16. 7225
  17. 5329
  18. 3721
  19. 4624
  20. 1681
  21. 8836
  22. 1225
  23. 4225
  24. 4761
  25. 1296
  26. 6084
  27. 9216
  28. 1444
  29. 3844
  30. 2304
  31. 2401
  32. 3025
  33. 2116
  34. 8281
  35. 7396
  36. 1369
  37. 5041
  38. 6889
  39. 1936
  40. 2809

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