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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 931 · 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. 2.36² =
  3. 3.72² =
  4. 4.92² =
  5. 5.38² =
  6. 6.53² =
  7. 7.34² =
  8. 8.42² =
  9. 9.77² =
  10. 10.83² =
  11. 11.68² =
  12. 12.39² =
  13. 13.54² =
  14. 14.33² =
  15. 15.31² =
  16. 16.73² =
  17. 17.41² =
  18. 18.48² =
  19. 19.58² =
  20. 20.45² =
  21. 21.75² =
  22. 22.49² =
  23. 23.61² =
  24. 24.52² =
  25. 25.44² =
  26. 26.95² =
  27. 27.82² =
  28. 28.37² =
  29. 29.57² =
  30. 30.51² =
  31. 31.74² =
  32. 32.69² =
  33. 33.67² =
  34. 34.32² =
  35. 35.71² =
  36. 36.63² =
  37. 37.79² =
  38. 38.46² =
  39. 39.96² =
  40. 40.91² =

Answer key

  1. 3844
  2. 1296
  3. 5184
  4. 8464
  5. 1444
  6. 2809
  7. 1156
  8. 1764
  9. 5929
  10. 6889
  11. 4624
  12. 1521
  13. 2916
  14. 1089
  15. 961
  16. 5329
  17. 1681
  18. 2304
  19. 3364
  20. 2025
  21. 5625
  22. 2401
  23. 3721
  24. 2704
  25. 1936
  26. 9025
  27. 6724
  28. 1369
  29. 3249
  30. 2601
  31. 5476
  32. 4761
  33. 4489
  34. 1024
  35. 5041
  36. 3969
  37. 6241
  38. 2116
  39. 9216
  40. 8281

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