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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 502 · 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. 1.43² =
  2. 2.81² =
  3. 3.42² =
  4. 4.49² =
  5. 5.51² =
  6. 6.87² =
  7. 7.65² =
  8. 8.98² =
  9. 9.67² =
  10. 10.75² =
  11. 11.92² =
  12. 12.41² =
  13. 13.52² =
  14. 14.61² =
  15. 15.57² =
  16. 16.97² =
  17. 17.53² =
  18. 18.74² =
  19. 19.38² =
  20. 20.58² =
  21. 21.66² =
  22. 22.83² =
  23. 23.73² =
  24. 24.46² =
  25. 25.34² =
  26. 26.84² =
  27. 27.44² =
  28. 28.59² =
  29. 29.37² =
  30. 30.45² =
  31. 31.79² =
  32. 32.47² =
  33. 33.78² =
  34. 34.31² =
  35. 35.64² =
  36. 36.32² =
  37. 37.89² =
  38. 38.36² =
  39. 39.99² =
  40. 40.82² =

Answer key

  1. 1849
  2. 6561
  3. 1764
  4. 2401
  5. 2601
  6. 7569
  7. 4225
  8. 9604
  9. 4489
  10. 5625
  11. 8464
  12. 1681
  13. 2704
  14. 3721
  15. 3249
  16. 9409
  17. 2809
  18. 5476
  19. 1444
  20. 3364
  21. 4356
  22. 6889
  23. 5329
  24. 2116
  25. 1156
  26. 7056
  27. 1936
  28. 3481
  29. 1369
  30. 2025
  31. 6241
  32. 2209
  33. 6084
  34. 961
  35. 4096
  36. 1024
  37. 7921
  38. 1296
  39. 9801
  40. 6724

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