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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 210 · 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. 1.41² =
  2. 2.43² =
  3. 3.72² =
  4. 4.89² =
  5. 5.77² =
  6. 6.66² =
  7. 7.46² =
  8. 8.59² =
  9. 9.62² =
  10. 10.48² =
  11. 11.61² =
  12. 12.52² =
  13. 13.83² =
  14. 14.91² =
  15. 15.44² =
  16. 16.82² =
  17. 17.31² =
  18. 18.94² =
  19. 19.75² =
  20. 20.99² =
  21. 21.68² =
  22. 22.35² =
  23. 23.79² =
  24. 24.95² =
  25. 25.51² =
  26. 26.92² =
  27. 27.76² =
  28. 28.57² =
  29. 29.34² =
  30. 30.69² =
  31. 31.58² =
  32. 32.64² =
  33. 33.39² =
  34. 34.98² =
  35. 35.36² =
  36. 36.38² =
  37. 37.73² =
  38. 38.97² =
  39. 39.54² =
  40. 40.33² =

Answer key

  1. 1681
  2. 1849
  3. 5184
  4. 7921
  5. 5929
  6. 4356
  7. 2116
  8. 3481
  9. 3844
  10. 2304
  11. 3721
  12. 2704
  13. 6889
  14. 8281
  15. 1936
  16. 6724
  17. 961
  18. 8836
  19. 5625
  20. 9801
  21. 4624
  22. 1225
  23. 6241
  24. 9025
  25. 2601
  26. 8464
  27. 5776
  28. 3249
  29. 1156
  30. 4761
  31. 3364
  32. 4096
  33. 1521
  34. 9604
  35. 1296
  36. 1444
  37. 5329
  38. 9409
  39. 2916
  40. 1089

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