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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 482 · 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. 1.31² =
  2. 2.43² =
  3. 3.57² =
  4. 4.53² =
  5. 5.73² =
  6. 6.99² =
  7. 7.74² =
  8. 8.67² =
  9. 9.38² =
  10. 10.91² =
  11. 11.44² =
  12. 12.85² =
  13. 13.69² =
  14. 14.94² =
  15. 15.59² =
  16. 16.58² =
  17. 17.52² =
  18. 18.35² =
  19. 19.72² =
  20. 20.81² =
  21. 21.41² =
  22. 22.63² =
  23. 23.47² =
  24. 24.36² =
  25. 25.71² =
  26. 26.92² =
  27. 27.75² =
  28. 28.34² =
  29. 29.39² =
  30. 30.79² =
  31. 31.49² =
  32. 32.93² =
  33. 33.98² =
  34. 34.37² =
  35. 35.46² =
  36. 36.62² =
  37. 37.76² =
  38. 38.68² =
  39. 39.95² =
  40. 40.55² =

Answer key

  1. 961
  2. 1849
  3. 3249
  4. 2809
  5. 5329
  6. 9801
  7. 5476
  8. 4489
  9. 1444
  10. 8281
  11. 1936
  12. 7225
  13. 4761
  14. 8836
  15. 3481
  16. 3364
  17. 2704
  18. 1225
  19. 5184
  20. 6561
  21. 1681
  22. 3969
  23. 2209
  24. 1296
  25. 5041
  26. 8464
  27. 5625
  28. 1156
  29. 1521
  30. 6241
  31. 2401
  32. 8649
  33. 9604
  34. 1369
  35. 2116
  36. 3844
  37. 5776
  38. 4624
  39. 9025
  40. 3025

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