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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 546 · 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. 1.93² =
  2. 2.76² =
  3. 3.68² =
  4. 4.91² =
  5. 5.57² =
  6. 6.67² =
  7. 7.49² =
  8. 8.97² =
  9. 9.63² =
  10. 10.96² =
  11. 11.69² =
  12. 12.61² =
  13. 13.45² =
  14. 14.34² =
  15. 15.88² =
  16. 16.42² =
  17. 17.75² =
  18. 18.38² =
  19. 19.59² =
  20. 20.46² =
  21. 21.41² =
  22. 22.85² =
  23. 23.64² =
  24. 24.86² =
  25. 25.37² =
  26. 26.71² =
  27. 27.36² =
  28. 28.51² =
  29. 29.31² =
  30. 30.48² =
  31. 31.54² =
  32. 32.53² =
  33. 33.77² =
  34. 34.98² =
  35. 35.65² =
  36. 36.79² =
  37. 37.39² =
  38. 38.95² =
  39. 39.47² =
  40. 40.99² =

Answer key

  1. 8649
  2. 5776
  3. 4624
  4. 8281
  5. 3249
  6. 4489
  7. 2401
  8. 9409
  9. 3969
  10. 9216
  11. 4761
  12. 3721
  13. 2025
  14. 1156
  15. 7744
  16. 1764
  17. 5625
  18. 1444
  19. 3481
  20. 2116
  21. 1681
  22. 7225
  23. 4096
  24. 7396
  25. 1369
  26. 5041
  27. 1296
  28. 2601
  29. 961
  30. 2304
  31. 2916
  32. 2809
  33. 5929
  34. 9604
  35. 4225
  36. 6241
  37. 1521
  38. 9025
  39. 2209
  40. 9801

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