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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 609 · 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. 1.89² =
  2. 2.91² =
  3. 3.37² =
  4. 4.49² =
  5. 5.63² =
  6. 6.62² =
  7. 7.73² =
  8. 8.78² =
  9. 9.64² =
  10. 10.56² =
  11. 11.98² =
  12. 12.61² =
  13. 13.68² =
  14. 14.43² =
  15. 15.82² =
  16. 16.58² =
  17. 17.79² =
  18. 18.67² =
  19. 19.34² =
  20. 20.38² =
  21. 21.65² =
  22. 22.77² =
  23. 23.33² =
  24. 24.84² =
  25. 25.69² =
  26. 26.47² =
  27. 27.83² =
  28. 28.93² =
  29. 29.97² =
  30. 30.41² =
  31. 31.46² =
  32. 32.44² =
  33. 33.99² =
  34. 34.71² =
  35. 35.52² =
  36. 36.87² =
  37. 37.31² =
  38. 38.54² =
  39. 39.51² =
  40. 40.57² =

Answer key

  1. 7921
  2. 8281
  3. 1369
  4. 2401
  5. 3969
  6. 3844
  7. 5329
  8. 6084
  9. 4096
  10. 3136
  11. 9604
  12. 3721
  13. 4624
  14. 1849
  15. 6724
  16. 3364
  17. 6241
  18. 4489
  19. 1156
  20. 1444
  21. 4225
  22. 5929
  23. 1089
  24. 7056
  25. 4761
  26. 2209
  27. 6889
  28. 8649
  29. 9409
  30. 1681
  31. 2116
  32. 1936
  33. 9801
  34. 5041
  35. 2704
  36. 7569
  37. 961
  38. 2916
  39. 2601
  40. 3249

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