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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 878 · 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. 1.39² =
  2. 2.36² =
  3. 3.53² =
  4. 4.83² =
  5. 5.61² =
  6. 6.44² =
  7. 7.32² =
  8. 8.71² =
  9. 9.68² =
  10. 10.95² =
  11. 11.74² =
  12. 12.72² =
  13. 13.46² =
  14. 14.55² =
  15. 15.41² =
  16. 16.51² =
  17. 17.64² =
  18. 18.86² =
  19. 19.82² =
  20. 20.38² =
  21. 21.75² =
  22. 22.91² =
  23. 23.85² =
  24. 24.59² =
  25. 25.42² =
  26. 26.77² =
  27. 27.88² =
  28. 28.97² =
  29. 29.81² =
  30. 30.48² =
  31. 31.65² =
  32. 32.52² =
  33. 33.47² =
  34. 34.92² =
  35. 35.37² =
  36. 36.45² =
  37. 37.35² =
  38. 38.93² =
  39. 39.79² =
  40. 40.87² =

Answer key

  1. 1521
  2. 1296
  3. 2809
  4. 6889
  5. 3721
  6. 1936
  7. 1024
  8. 5041
  9. 4624
  10. 9025
  11. 5476
  12. 5184
  13. 2116
  14. 3025
  15. 1681
  16. 2601
  17. 4096
  18. 7396
  19. 6724
  20. 1444
  21. 5625
  22. 8281
  23. 7225
  24. 3481
  25. 1764
  26. 5929
  27. 7744
  28. 9409
  29. 6561
  30. 2304
  31. 4225
  32. 2704
  33. 2209
  34. 8464
  35. 1369
  36. 2025
  37. 1225
  38. 8649
  39. 6241
  40. 7569

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