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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 823 · 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. 1.43² =
  2. 2.64² =
  3. 3.65² =
  4. 4.49² =
  5. 5.44² =
  6. 6.71² =
  7. 7.78² =
  8. 8.61² =
  9. 9.99² =
  10. 10.81² =
  11. 11.35² =
  12. 12.58² =
  13. 13.52² =
  14. 14.54² =
  15. 15.62² =
  16. 16.91² =
  17. 17.73² =
  18. 18.85² =
  19. 19.38² =
  20. 20.46² =
  21. 21.77² =
  22. 22.63² =
  23. 23.55² =
  24. 24.59² =
  25. 25.53² =
  26. 26.48² =
  27. 27.37² =
  28. 28.69² =
  29. 29.66² =
  30. 30.56² =
  31. 31.94² =
  32. 32.68² =
  33. 33.93² =
  34. 34.76² =
  35. 35.82² =
  36. 36.97² =
  37. 37.57² =
  38. 38.51² =
  39. 39.89² =
  40. 40.36² =

Answer key

  1. 1849
  2. 4096
  3. 4225
  4. 2401
  5. 1936
  6. 5041
  7. 6084
  8. 3721
  9. 9801
  10. 6561
  11. 1225
  12. 3364
  13. 2704
  14. 2916
  15. 3844
  16. 8281
  17. 5329
  18. 7225
  19. 1444
  20. 2116
  21. 5929
  22. 3969
  23. 3025
  24. 3481
  25. 2809
  26. 2304
  27. 1369
  28. 4761
  29. 4356
  30. 3136
  31. 8836
  32. 4624
  33. 8649
  34. 5776
  35. 6724
  36. 9409
  37. 3249
  38. 2601
  39. 7921
  40. 1296

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