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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 554 · 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. 1.94² =
  2. 2.75² =
  3. 3.65² =
  4. 4.68² =
  5. 5.81² =
  6. 6.93² =
  7. 7.38² =
  8. 8.42² =
  9. 9.76² =
  10. 10.41² =
  11. 11.37² =
  12. 12.66² =
  13. 13.39² =
  14. 14.69² =
  15. 15.86² =
  16. 16.32² =
  17. 17.78² =
  18. 18.57² =
  19. 19.67² =
  20. 20.99² =
  21. 21.33² =
  22. 22.52² =
  23. 23.72² =
  24. 24.87² =
  25. 25.59² =
  26. 26.85² =
  27. 27.43² =
  28. 28.91² =
  29. 29.31² =
  30. 30.61² =
  31. 31.55² =
  32. 32.54² =
  33. 33.97² =
  34. 34.34² =
  35. 35.45² =
  36. 36.89² =
  37. 37.56² =
  38. 38.83² =
  39. 39.73² =
  40. 40.71² =

Answer key

  1. 8836
  2. 5625
  3. 4225
  4. 4624
  5. 6561
  6. 8649
  7. 1444
  8. 1764
  9. 5776
  10. 1681
  11. 1369
  12. 4356
  13. 1521
  14. 4761
  15. 7396
  16. 1024
  17. 6084
  18. 3249
  19. 4489
  20. 9801
  21. 1089
  22. 2704
  23. 5184
  24. 7569
  25. 3481
  26. 7225
  27. 1849
  28. 8281
  29. 961
  30. 3721
  31. 3025
  32. 2916
  33. 9409
  34. 1156
  35. 2025
  36. 7921
  37. 3136
  38. 6889
  39. 5329
  40. 5041

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