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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 167 · 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. 1.97² =
  2. 2.87² =
  3. 3.71² =
  4. 4.65² =
  5. 5.46² =
  6. 6.98² =
  7. 7.31² =
  8. 8.99² =
  9. 9.74² =
  10. 10.37² =
  11. 11.39² =
  12. 12.85² =
  13. 13.58² =
  14. 14.66² =
  15. 15.48² =
  16. 16.34² =
  17. 17.42² =
  18. 18.92² =
  19. 19.57² =
  20. 20.93² =
  21. 21.77² =
  22. 22.52² =
  23. 23.41² =
  24. 24.61² =
  25. 25.96² =
  26. 26.38² =
  27. 27.82² =
  28. 28.62² =
  29. 29.79² =
  30. 30.69² =
  31. 31.43² =
  32. 32.45² =
  33. 33.81² =
  34. 34.94² =
  35. 35.68² =
  36. 36.91² =
  37. 37.76² =
  38. 38.86² =
  39. 39.54² =
  40. 40.35² =

Answer key

  1. 9409
  2. 7569
  3. 5041
  4. 4225
  5. 2116
  6. 9604
  7. 961
  8. 9801
  9. 5476
  10. 1369
  11. 1521
  12. 7225
  13. 3364
  14. 4356
  15. 2304
  16. 1156
  17. 1764
  18. 8464
  19. 3249
  20. 8649
  21. 5929
  22. 2704
  23. 1681
  24. 3721
  25. 9216
  26. 1444
  27. 6724
  28. 3844
  29. 6241
  30. 4761
  31. 1849
  32. 2025
  33. 6561
  34. 8836
  35. 4624
  36. 8281
  37. 5776
  38. 7396
  39. 2916
  40. 1225

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