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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 92 · 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. 1.57² =
  2. 2.41² =
  3. 3.32² =
  4. 4.82² =
  5. 5.95² =
  6. 6.76² =
  7. 7.98² =
  8. 8.74² =
  9. 9.86² =
  10. 10.99² =
  11. 11.39² =
  12. 12.78² =
  13. 13.75² =
  14. 14.65² =
  15. 15.55² =
  16. 16.38² =
  17. 17.81² =
  18. 18.37² =
  19. 19.62² =
  20. 20.84² =
  21. 21.48² =
  22. 22.89² =
  23. 23.71² =
  24. 24.85² =
  25. 25.91² =
  26. 26.63² =
  27. 27.51² =
  28. 28.42² =
  29. 29.61² =
  30. 30.94² =
  31. 31.56² =
  32. 32.43² =
  33. 33.52² =
  34. 34.46² =
  35. 35.96² =
  36. 36.92² =
  37. 37.73² =
  38. 38.58² =
  39. 39.35² =
  40. 40.87² =

Answer key

  1. 3249
  2. 1681
  3. 1024
  4. 6724
  5. 9025
  6. 5776
  7. 9604
  8. 5476
  9. 7396
  10. 9801
  11. 1521
  12. 6084
  13. 5625
  14. 4225
  15. 3025
  16. 1444
  17. 6561
  18. 1369
  19. 3844
  20. 7056
  21. 2304
  22. 7921
  23. 5041
  24. 7225
  25. 8281
  26. 3969
  27. 2601
  28. 1764
  29. 3721
  30. 8836
  31. 3136
  32. 1849
  33. 2704
  34. 2116
  35. 9216
  36. 8464
  37. 5329
  38. 3364
  39. 1225
  40. 7569

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