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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 614 · 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. 2.46² =
  3. 3.69² =
  4. 4.61² =
  5. 5.67² =
  6. 6.42² =
  7. 7.35² =
  8. 8.94² =
  9. 9.38² =
  10. 10.48² =
  11. 11.81² =
  12. 12.41² =
  13. 13.34² =
  14. 14.98² =
  15. 15.99² =
  16. 16.91² =
  17. 17.36² =
  18. 18.32² =
  19. 19.44² =
  20. 20.86² =
  21. 21.92² =
  22. 22.72² =
  23. 23.57² =
  24. 24.64² =
  25. 25.39² =
  26. 26.31² =
  27. 27.88² =
  28. 28.55² =
  29. 29.49² =
  30. 30.53² =
  31. 31.77² =
  32. 32.62² =
  33. 33.47² =
  34. 34.74² =
  35. 35.76² =
  36. 36.84² =
  37. 37.87² =
  38. 38.96² =
  39. 39.78² =
  40. 40.73² =

Answer key

  1. 2601
  2. 2116
  3. 4761
  4. 3721
  5. 4489
  6. 1764
  7. 1225
  8. 8836
  9. 1444
  10. 2304
  11. 6561
  12. 1681
  13. 1156
  14. 9604
  15. 9801
  16. 8281
  17. 1296
  18. 1024
  19. 1936
  20. 7396
  21. 8464
  22. 5184
  23. 3249
  24. 4096
  25. 1521
  26. 961
  27. 7744
  28. 3025
  29. 2401
  30. 2809
  31. 5929
  32. 3844
  33. 2209
  34. 5476
  35. 5776
  36. 7056
  37. 7569
  38. 9216
  39. 6084
  40. 5329

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