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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 496 · 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. 1.62² =
  2. 2.72² =
  3. 3.42² =
  4. 4.52² =
  5. 5.85² =
  6. 6.41² =
  7. 7.32² =
  8. 8.83² =
  9. 9.43² =
  10. 10.95² =
  11. 11.36² =
  12. 12.92² =
  13. 13.91² =
  14. 14.38² =
  15. 15.66² =
  16. 16.34² =
  17. 17.93² =
  18. 18.49² =
  19. 19.31² =
  20. 20.89² =
  21. 21.86² =
  22. 22.75² =
  23. 23.35² =
  24. 24.37² =
  25. 25.45² =
  26. 26.79² =
  27. 27.48² =
  28. 28.39² =
  29. 29.65² =
  30. 30.51² =
  31. 31.81² =
  32. 32.47² =
  33. 33.88² =
  34. 34.58² =
  35. 35.74² =
  36. 36.82² =
  37. 37.57² =
  38. 38.44² =
  39. 39.55² =
  40. 40.33² =

Answer key

  1. 3844
  2. 5184
  3. 1764
  4. 2704
  5. 7225
  6. 1681
  7. 1024
  8. 6889
  9. 1849
  10. 9025
  11. 1296
  12. 8464
  13. 8281
  14. 1444
  15. 4356
  16. 1156
  17. 8649
  18. 2401
  19. 961
  20. 7921
  21. 7396
  22. 5625
  23. 1225
  24. 1369
  25. 2025
  26. 6241
  27. 2304
  28. 1521
  29. 4225
  30. 2601
  31. 6561
  32. 2209
  33. 7744
  34. 3364
  35. 5476
  36. 6724
  37. 3249
  38. 1936
  39. 3025
  40. 1089

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