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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 494 · 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. 1.61² =
  2. 2.73² =
  3. 3.98² =
  4. 4.96² =
  5. 5.58² =
  6. 6.82² =
  7. 7.51² =
  8. 8.42² =
  9. 9.41² =
  10. 10.32² =
  11. 11.79² =
  12. 12.95² =
  13. 13.67² =
  14. 14.84² =
  15. 15.69² =
  16. 16.85² =
  17. 17.31² =
  18. 18.39² =
  19. 19.88² =
  20. 20.53² =
  21. 21.78² =
  22. 22.49² =
  23. 23.86² =
  24. 24.72² =
  25. 25.34² =
  26. 26.75² =
  27. 27.46² =
  28. 28.65² =
  29. 29.38² =
  30. 30.97² =
  31. 31.91² =
  32. 32.77² =
  33. 33.45² =
  34. 34.37² =
  35. 35.93² =
  36. 36.81² =
  37. 37.59² =
  38. 38.83² =
  39. 39.43² =
  40. 40.89² =

Answer key

  1. 3721
  2. 5329
  3. 9604
  4. 9216
  5. 3364
  6. 6724
  7. 2601
  8. 1764
  9. 1681
  10. 1024
  11. 6241
  12. 9025
  13. 4489
  14. 7056
  15. 4761
  16. 7225
  17. 961
  18. 1521
  19. 7744
  20. 2809
  21. 6084
  22. 2401
  23. 7396
  24. 5184
  25. 1156
  26. 5625
  27. 2116
  28. 4225
  29. 1444
  30. 9409
  31. 8281
  32. 5929
  33. 2025
  34. 1369
  35. 8649
  36. 6561
  37. 3481
  38. 6889
  39. 1849
  40. 7921

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