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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 221 · 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. 2.95² =
  3. 3.61² =
  4. 4.44² =
  5. 5.91² =
  6. 6.42² =
  7. 7.49² =
  8. 8.92² =
  9. 9.82² =
  10. 10.83² =
  11. 11.73² =
  12. 12.45² =
  13. 13.69² =
  14. 14.52² =
  15. 15.78² =
  16. 16.36² =
  17. 17.58² =
  18. 18.71² =
  19. 19.35² =
  20. 20.63² =
  21. 21.46² =
  22. 22.62² =
  23. 23.68² =
  24. 24.39² =
  25. 25.51² =
  26. 26.34² =
  27. 27.48² =
  28. 28.72² =
  29. 29.67² =
  30. 30.75² =
  31. 31.31² =
  32. 32.38² =
  33. 33.81² =
  34. 34.56² =
  35. 35.74² =
  36. 36.89² =
  37. 37.66² =
  38. 38.33² =
  39. 39.76² =
  40. 40.86² =

Answer key

  1. 1681
  2. 9025
  3. 3721
  4. 1936
  5. 8281
  6. 1764
  7. 2401
  8. 8464
  9. 6724
  10. 6889
  11. 5329
  12. 2025
  13. 4761
  14. 2704
  15. 6084
  16. 1296
  17. 3364
  18. 5041
  19. 1225
  20. 3969
  21. 2116
  22. 3844
  23. 4624
  24. 1521
  25. 2601
  26. 1156
  27. 2304
  28. 5184
  29. 4489
  30. 5625
  31. 961
  32. 1444
  33. 6561
  34. 3136
  35. 5476
  36. 7921
  37. 4356
  38. 1089
  39. 5776
  40. 7396

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