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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 441 · 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. 1.64² =
  2. 2.49² =
  3. 3.97² =
  4. 4.82² =
  5. 5.47² =
  6. 6.81² =
  7. 7.54² =
  8. 8.32² =
  9. 9.77² =
  10. 10.41² =
  11. 11.31² =
  12. 12.48² =
  13. 13.95² =
  14. 14.89² =
  15. 15.93² =
  16. 16.87² =
  17. 17.96² =
  18. 18.86² =
  19. 19.91² =
  20. 20.88² =
  21. 21.46² =
  22. 22.53² =
  23. 23.37² =
  24. 24.35² =
  25. 25.57² =
  26. 26.63² =
  27. 27.59² =
  28. 28.43² =
  29. 29.58² =
  30. 30.69² =
  31. 31.98² =
  32. 32.34² =
  33. 33.71² =
  34. 34.75² =
  35. 35.76² =
  36. 36.61² =
  37. 37.38² =
  38. 38.36² =
  39. 39.33² =
  40. 40.52² =

Answer key

  1. 4096
  2. 2401
  3. 9409
  4. 6724
  5. 2209
  6. 6561
  7. 2916
  8. 1024
  9. 5929
  10. 1681
  11. 961
  12. 2304
  13. 9025
  14. 7921
  15. 8649
  16. 7569
  17. 9216
  18. 7396
  19. 8281
  20. 7744
  21. 2116
  22. 2809
  23. 1369
  24. 1225
  25. 3249
  26. 3969
  27. 3481
  28. 1849
  29. 3364
  30. 4761
  31. 9604
  32. 1156
  33. 5041
  34. 5625
  35. 5776
  36. 3721
  37. 1444
  38. 1296
  39. 1089
  40. 2704

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