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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 942 · 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. 1.72² =
  2. 2.54² =
  3. 3.32² =
  4. 4.63² =
  5. 5.73² =
  6. 6.95² =
  7. 7.53² =
  8. 8.82² =
  9. 9.39² =
  10. 10.87² =
  11. 11.96² =
  12. 12.77² =
  13. 13.37² =
  14. 14.66² =
  15. 15.33² =
  16. 16.41² =
  17. 17.86² =
  18. 18.59² =
  19. 19.55² =
  20. 20.62² =
  21. 21.91² =
  22. 22.61² =
  23. 23.81² =
  24. 24.83² =
  25. 25.93² =
  26. 26.52² =
  27. 27.78² =
  28. 28.88² =
  29. 29.89² =
  30. 30.42² =
  31. 31.46² =
  32. 32.94² =
  33. 33.38² =
  34. 34.64² =
  35. 35.75² =
  36. 36.43² =
  37. 37.35² =
  38. 38.58² =
  39. 39.48² =
  40. 40.34² =

Answer key

  1. 5184
  2. 2916
  3. 1024
  4. 3969
  5. 5329
  6. 9025
  7. 2809
  8. 6724
  9. 1521
  10. 7569
  11. 9216
  12. 5929
  13. 1369
  14. 4356
  15. 1089
  16. 1681
  17. 7396
  18. 3481
  19. 3025
  20. 3844
  21. 8281
  22. 3721
  23. 6561
  24. 6889
  25. 8649
  26. 2704
  27. 6084
  28. 7744
  29. 7921
  30. 1764
  31. 2116
  32. 8836
  33. 1444
  34. 4096
  35. 5625
  36. 1849
  37. 1225
  38. 3364
  39. 2304
  40. 1156

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