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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 901 · 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. 1.89² =
  2. 2.91² =
  3. 3.36² =
  4. 4.45² =
  5. 5.37² =
  6. 6.43² =
  7. 7.49² =
  8. 8.39² =
  9. 9.46² =
  10. 10.83² =
  11. 11.87² =
  12. 12.41² =
  13. 13.77² =
  14. 14.79² =
  15. 15.42² =
  16. 16.59² =
  17. 17.63² =
  18. 18.48² =
  19. 19.81² =
  20. 20.58² =
  21. 21.74² =
  22. 22.69² =
  23. 23.75² =
  24. 24.56² =
  25. 25.66² =
  26. 26.97² =
  27. 27.72² =
  28. 28.96² =
  29. 29.99² =
  30. 30.51² =
  31. 31.61² =
  32. 32.47² =
  33. 33.32² =
  34. 34.94² =
  35. 35.44² =
  36. 36.64² =
  37. 37.57² =
  38. 38.98² =
  39. 39.92² =
  40. 40.78² =

Answer key

  1. 7921
  2. 8281
  3. 1296
  4. 2025
  5. 1369
  6. 1849
  7. 2401
  8. 1521
  9. 2116
  10. 6889
  11. 7569
  12. 1681
  13. 5929
  14. 6241
  15. 1764
  16. 3481
  17. 3969
  18. 2304
  19. 6561
  20. 3364
  21. 5476
  22. 4761
  23. 5625
  24. 3136
  25. 4356
  26. 9409
  27. 5184
  28. 9216
  29. 9801
  30. 2601
  31. 3721
  32. 2209
  33. 1024
  34. 8836
  35. 1936
  36. 4096
  37. 3249
  38. 9604
  39. 8464
  40. 6084

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