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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 360 · 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. 1.32² =
  2. 2.31² =
  3. 3.55² =
  4. 4.38² =
  5. 5.48² =
  6. 6.78² =
  7. 7.41² =
  8. 8.59² =
  9. 9.45² =
  10. 10.58² =
  11. 11.93² =
  12. 12.75² =
  13. 13.62² =
  14. 14.35² =
  15. 15.37² =
  16. 16.43² =
  17. 17.82² =
  18. 18.89² =
  19. 19.44² =
  20. 20.72² =
  21. 21.42² =
  22. 22.39² =
  23. 23.77² =
  24. 24.49² =
  25. 25.36² =
  26. 26.97² =
  27. 27.92² =
  28. 28.79² =
  29. 29.83² =
  30. 30.64² =
  31. 31.57² =
  32. 32.56² =
  33. 33.88² =
  34. 34.52² =
  35. 35.66² =
  36. 36.99² =
  37. 37.61² =
  38. 38.69² =
  39. 39.71² =
  40. 40.94² =

Answer key

  1. 1024
  2. 961
  3. 3025
  4. 1444
  5. 2304
  6. 6084
  7. 1681
  8. 3481
  9. 2025
  10. 3364
  11. 8649
  12. 5625
  13. 3844
  14. 1225
  15. 1369
  16. 1849
  17. 6724
  18. 7921
  19. 1936
  20. 5184
  21. 1764
  22. 1521
  23. 5929
  24. 2401
  25. 1296
  26. 9409
  27. 8464
  28. 6241
  29. 6889
  30. 4096
  31. 3249
  32. 3136
  33. 7744
  34. 2704
  35. 4356
  36. 9801
  37. 3721
  38. 4761
  39. 5041
  40. 8836

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