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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 843 · 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. 1.47² =
  2. 2.43² =
  3. 3.54² =
  4. 4.57² =
  5. 5.92² =
  6. 6.88² =
  7. 7.77² =
  8. 8.95² =
  9. 9.32² =
  10. 10.46² =
  11. 11.91² =
  12. 12.31² =
  13. 13.72² =
  14. 14.36² =
  15. 15.49² =
  16. 16.66² =
  17. 17.48² =
  18. 18.56² =
  19. 19.61² =
  20. 20.99² =
  21. 21.65² =
  22. 22.84² =
  23. 23.53² =
  24. 24.37² =
  25. 25.81² =
  26. 26.76² =
  27. 27.44² =
  28. 28.68² =
  29. 29.82² =
  30. 30.59² =
  31. 31.79² =
  32. 32.96² =
  33. 33.85² =
  34. 34.69² =
  35. 35.62² =
  36. 36.93² =
  37. 37.34² =
  38. 38.58² =
  39. 39.71² =
  40. 40.42² =

Answer key

  1. 2209
  2. 1849
  3. 2916
  4. 3249
  5. 8464
  6. 7744
  7. 5929
  8. 9025
  9. 1024
  10. 2116
  11. 8281
  12. 961
  13. 5184
  14. 1296
  15. 2401
  16. 4356
  17. 2304
  18. 3136
  19. 3721
  20. 9801
  21. 4225
  22. 7056
  23. 2809
  24. 1369
  25. 6561
  26. 5776
  27. 1936
  28. 4624
  29. 6724
  30. 3481
  31. 6241
  32. 9216
  33. 7225
  34. 4761
  35. 3844
  36. 8649
  37. 1156
  38. 3364
  39. 5041
  40. 1764

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