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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 953 · 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. 1.74² =
  2. 2.44² =
  3. 3.42² =
  4. 4.41² =
  5. 5.84² =
  6. 6.81² =
  7. 7.62² =
  8. 8.58² =
  9. 9.98² =
  10. 10.69² =
  11. 11.64² =
  12. 12.37² =
  13. 13.85² =
  14. 14.77² =
  15. 15.51² =
  16. 16.56² =
  17. 17.32² =
  18. 18.48² =
  19. 19.39² =
  20. 20.36² =
  21. 21.47² =
  22. 22.43² =
  23. 23.96² =
  24. 24.61² =
  25. 25.49² =
  26. 26.31² =
  27. 27.87² =
  28. 28.86² =
  29. 29.91² =
  30. 30.89² =
  31. 31.71² =
  32. 32.68² =
  33. 33.93² =
  34. 34.82² =
  35. 35.46² =
  36. 36.43² =
  37. 37.54² =
  38. 38.79² =
  39. 39.99² =
  40. 40.52² =

Answer key

  1. 5476
  2. 1936
  3. 1764
  4. 1681
  5. 7056
  6. 6561
  7. 3844
  8. 3364
  9. 9604
  10. 4761
  11. 4096
  12. 1369
  13. 7225
  14. 5929
  15. 2601
  16. 3136
  17. 1024
  18. 2304
  19. 1521
  20. 1296
  21. 2209
  22. 1849
  23. 9216
  24. 3721
  25. 2401
  26. 961
  27. 7569
  28. 7396
  29. 8281
  30. 7921
  31. 5041
  32. 4624
  33. 8649
  34. 6724
  35. 2116
  36. 1849
  37. 2916
  38. 6241
  39. 9801
  40. 2704

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