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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 301 · 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. 1.74² =
  2. 2.31² =
  3. 3.91² =
  4. 4.65² =
  5. 5.42² =
  6. 6.85² =
  7. 7.48² =
  8. 8.81² =
  9. 9.61² =
  10. 10.77² =
  11. 11.92² =
  12. 12.69² =
  13. 13.79² =
  14. 14.54² =
  15. 15.55² =
  16. 16.86² =
  17. 17.41² =
  18. 18.58² =
  19. 19.51² =
  20. 20.71² =
  21. 21.66² =
  22. 22.62² =
  23. 23.34² =
  24. 24.44² =
  25. 25.78² =
  26. 26.88² =
  27. 27.32² =
  28. 28.72² =
  29. 29.83² =
  30. 30.38² =
  31. 31.75² =
  32. 32.52² =
  33. 33.67² =
  34. 34.43² =
  35. 35.39² =
  36. 36.82² =
  37. 37.36² =
  38. 38.49² =
  39. 39.46² =
  40. 40.94² =

Answer key

  1. 5476
  2. 961
  3. 8281
  4. 4225
  5. 1764
  6. 7225
  7. 2304
  8. 6561
  9. 3721
  10. 5929
  11. 8464
  12. 4761
  13. 6241
  14. 2916
  15. 3025
  16. 7396
  17. 1681
  18. 3364
  19. 2601
  20. 5041
  21. 4356
  22. 3844
  23. 1156
  24. 1936
  25. 6084
  26. 7744
  27. 1024
  28. 5184
  29. 6889
  30. 1444
  31. 5625
  32. 2704
  33. 4489
  34. 1849
  35. 1521
  36. 6724
  37. 1296
  38. 2401
  39. 2116
  40. 8836

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