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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 580 · 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. 1.63² =
  2. 2.93² =
  3. 3.96² =
  4. 4.72² =
  5. 5.31² =
  6. 6.84² =
  7. 7.88² =
  8. 8.97² =
  9. 9.54² =
  10. 10.52² =
  11. 11.47² =
  12. 12.65² =
  13. 13.77² =
  14. 14.95² =
  15. 15.64² =
  16. 16.42² =
  17. 17.66² =
  18. 18.99² =
  19. 19.34² =
  20. 20.41² =
  21. 21.39² =
  22. 22.46² =
  23. 23.79² =
  24. 24.71² =
  25. 25.67² =
  26. 26.82² =
  27. 27.92² =
  28. 28.87² =
  29. 29.85² =
  30. 30.48² =
  31. 31.35² =
  32. 32.89² =
  33. 33.61² =
  34. 34.38² =
  35. 35.58² =
  36. 36.36² =
  37. 37.37² =
  38. 38.56² =
  39. 39.76² =
  40. 40.53² =

Answer key

  1. 3969
  2. 8649
  3. 9216
  4. 5184
  5. 961
  6. 7056
  7. 7744
  8. 9409
  9. 2916
  10. 2704
  11. 2209
  12. 4225
  13. 5929
  14. 9025
  15. 4096
  16. 1764
  17. 4356
  18. 9801
  19. 1156
  20. 1681
  21. 1521
  22. 2116
  23. 6241
  24. 5041
  25. 4489
  26. 6724
  27. 8464
  28. 7569
  29. 7225
  30. 2304
  31. 1225
  32. 7921
  33. 3721
  34. 1444
  35. 3364
  36. 1296
  37. 1369
  38. 3136
  39. 5776
  40. 2809

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