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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 101 · 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. 1.51² =
  2. 2.54² =
  3. 3.75² =
  4. 4.77² =
  5. 5.96² =
  6. 6.58² =
  7. 7.91² =
  8. 8.36² =
  9. 9.76² =
  10. 10.38² =
  11. 11.49² =
  12. 12.45² =
  13. 13.79² =
  14. 14.48² =
  15. 15.43² =
  16. 16.41² =
  17. 17.46² =
  18. 18.81² =
  19. 19.84² =
  20. 20.67² =
  21. 21.39² =
  22. 22.87² =
  23. 23.44² =
  24. 24.56² =
  25. 25.73² =
  26. 26.82² =
  27. 27.71² =
  28. 28.52² =
  29. 29.32² =
  30. 30.68² =
  31. 31.64² =
  32. 32.42² =
  33. 33.31² =
  34. 34.88² =
  35. 35.33² =
  36. 36.92² =
  37. 37.66² =
  38. 38.59² =
  39. 39.61² =
  40. 40.37² =

Answer key

  1. 2601
  2. 2916
  3. 5625
  4. 5929
  5. 9216
  6. 3364
  7. 8281
  8. 1296
  9. 5776
  10. 1444
  11. 2401
  12. 2025
  13. 6241
  14. 2304
  15. 1849
  16. 1681
  17. 2116
  18. 6561
  19. 7056
  20. 4489
  21. 1521
  22. 7569
  23. 1936
  24. 3136
  25. 5329
  26. 6724
  27. 5041
  28. 2704
  29. 1024
  30. 4624
  31. 4096
  32. 1764
  33. 961
  34. 7744
  35. 1089
  36. 8464
  37. 4356
  38. 3481
  39. 3721
  40. 1369

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