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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 540 · 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. 1.42² =
  2. 2.93² =
  3. 3.34² =
  4. 4.74² =
  5. 5.79² =
  6. 6.81² =
  7. 7.85² =
  8. 8.35² =
  9. 9.62² =
  10. 10.46² =
  11. 11.49² =
  12. 12.56² =
  13. 13.95² =
  14. 14.88² =
  15. 15.53² =
  16. 16.43² =
  17. 17.51² =
  18. 18.78² =
  19. 19.72² =
  20. 20.47² =
  21. 21.92² =
  22. 22.38² =
  23. 23.64² =
  24. 24.96² =
  25. 25.65² =
  26. 26.69² =
  27. 27.32² =
  28. 28.55² =
  29. 29.54² =
  30. 30.52² =
  31. 31.87² =
  32. 32.41² =
  33. 33.66² =
  34. 34.61² =
  35. 35.68² =
  36. 36.57² =
  37. 37.37² =
  38. 38.59² =
  39. 39.91² =
  40. 40.39² =

Answer key

  1. 1764
  2. 8649
  3. 1156
  4. 5476
  5. 6241
  6. 6561
  7. 7225
  8. 1225
  9. 3844
  10. 2116
  11. 2401
  12. 3136
  13. 9025
  14. 7744
  15. 2809
  16. 1849
  17. 2601
  18. 6084
  19. 5184
  20. 2209
  21. 8464
  22. 1444
  23. 4096
  24. 9216
  25. 4225
  26. 4761
  27. 1024
  28. 3025
  29. 2916
  30. 2704
  31. 7569
  32. 1681
  33. 4356
  34. 3721
  35. 4624
  36. 3249
  37. 1369
  38. 3481
  39. 8281
  40. 1521

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