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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 857 · 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. 1.62² =
  2. 2.54² =
  3. 3.91² =
  4. 4.87² =
  5. 5.79² =
  6. 6.92² =
  7. 7.71² =
  8. 8.58² =
  9. 9.35² =
  10. 10.48² =
  11. 11.61² =
  12. 12.82² =
  13. 13.41² =
  14. 14.96² =
  15. 15.56² =
  16. 16.57² =
  17. 17.47² =
  18. 18.74² =
  19. 19.39² =
  20. 20.99² =
  21. 21.73² =
  22. 22.37² =
  23. 23.83² =
  24. 24.42² =
  25. 25.88² =
  26. 26.36² =
  27. 27.32² =
  28. 28.66² =
  29. 29.44² =
  30. 30.59² =
  31. 31.72² =
  32. 32.64² =
  33. 33.33² =
  34. 34.43² =
  35. 35.52² =
  36. 36.77² =
  37. 37.76² =
  38. 38.34² =
  39. 39.53² =
  40. 40.78² =

Answer key

  1. 3844
  2. 2916
  3. 8281
  4. 7569
  5. 6241
  6. 8464
  7. 5041
  8. 3364
  9. 1225
  10. 2304
  11. 3721
  12. 6724
  13. 1681
  14. 9216
  15. 3136
  16. 3249
  17. 2209
  18. 5476
  19. 1521
  20. 9801
  21. 5329
  22. 1369
  23. 6889
  24. 1764
  25. 7744
  26. 1296
  27. 1024
  28. 4356
  29. 1936
  30. 3481
  31. 5184
  32. 4096
  33. 1089
  34. 1849
  35. 2704
  36. 5929
  37. 5776
  38. 1156
  39. 2809
  40. 6084

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