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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 766 · 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. 1.61² =
  2. 2.64² =
  3. 3.79² =
  4. 4.81² =
  5. 5.67² =
  6. 6.45² =
  7. 7.51² =
  8. 8.65² =
  9. 9.69² =
  10. 10.56² =
  11. 11.76² =
  12. 12.75² =
  13. 13.62² =
  14. 14.59² =
  15. 15.41² =
  16. 16.35² =
  17. 17.95² =
  18. 18.46² =
  19. 19.93² =
  20. 20.54² =
  21. 21.91² =
  22. 22.72² =
  23. 23.49² =
  24. 24.57² =
  25. 25.55² =
  26. 26.63² =
  27. 27.37² =
  28. 28.96² =
  29. 29.78² =
  30. 30.52² =
  31. 31.36² =
  32. 32.44² =
  33. 33.33² =
  34. 34.97² =
  35. 35.53² =
  36. 36.89² =
  37. 37.39² =
  38. 38.86² =
  39. 39.66² =
  40. 40.42² =

Answer key

  1. 3721
  2. 4096
  3. 6241
  4. 6561
  5. 4489
  6. 2025
  7. 2601
  8. 4225
  9. 4761
  10. 3136
  11. 5776
  12. 5625
  13. 3844
  14. 3481
  15. 1681
  16. 1225
  17. 9025
  18. 2116
  19. 8649
  20. 2916
  21. 8281
  22. 5184
  23. 2401
  24. 3249
  25. 3025
  26. 3969
  27. 1369
  28. 9216
  29. 6084
  30. 2704
  31. 1296
  32. 1936
  33. 1089
  34. 9409
  35. 2809
  36. 7921
  37. 1521
  38. 7396
  39. 4356
  40. 1764

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