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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 686 · 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. 1.34² =
  2. 2.69² =
  3. 3.39² =
  4. 4.58² =
  5. 5.42² =
  6. 6.96² =
  7. 7.61² =
  8. 8.85² =
  9. 9.97² =
  10. 10.99² =
  11. 11.95² =
  12. 12.41² =
  13. 13.32² =
  14. 14.98² =
  15. 15.64² =
  16. 16.93² =
  17. 17.37² =
  18. 18.43² =
  19. 19.82² =
  20. 20.47² =
  21. 21.52² =
  22. 22.36² =
  23. 23.44² =
  24. 24.94² =
  25. 25.91² =
  26. 26.67² =
  27. 27.48² =
  28. 28.65² =
  29. 29.83² =
  30. 30.92² =
  31. 31.75² =
  32. 32.71² =
  33. 33.38² =
  34. 34.31² =
  35. 35.35² =
  36. 36.81² =
  37. 37.63² =
  38. 38.66² =
  39. 39.45² =
  40. 40.49² =

Answer key

  1. 1156
  2. 4761
  3. 1521
  4. 3364
  5. 1764
  6. 9216
  7. 3721
  8. 7225
  9. 9409
  10. 9801
  11. 9025
  12. 1681
  13. 1024
  14. 9604
  15. 4096
  16. 8649
  17. 1369
  18. 1849
  19. 6724
  20. 2209
  21. 2704
  22. 1296
  23. 1936
  24. 8836
  25. 8281
  26. 4489
  27. 2304
  28. 4225
  29. 6889
  30. 8464
  31. 5625
  32. 5041
  33. 1444
  34. 961
  35. 1225
  36. 6561
  37. 3969
  38. 4356
  39. 2025
  40. 2401

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