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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 519 · 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. 1.97² =
  2. 2.44² =
  3. 3.32² =
  4. 4.58² =
  5. 5.47² =
  6. 6.74² =
  7. 7.48² =
  8. 8.94² =
  9. 9.65² =
  10. 10.61² =
  11. 11.95² =
  12. 12.37² =
  13. 13.35² =
  14. 14.67² =
  15. 15.86² =
  16. 16.68² =
  17. 17.42² =
  18. 18.62² =
  19. 19.78² =
  20. 20.49² =
  21. 21.93² =
  22. 22.88² =
  23. 23.41² =
  24. 24.66² =
  25. 25.85² =
  26. 26.91² =
  27. 27.79² =
  28. 28.38² =
  29. 29.45² =
  30. 30.73² =
  31. 31.87² =
  32. 32.69² =
  33. 33.56² =
  34. 34.77² =
  35. 35.52² =
  36. 36.34² =
  37. 37.84² =
  38. 38.51² =
  39. 39.81² =
  40. 40.82² =

Answer key

  1. 9409
  2. 1936
  3. 1024
  4. 3364
  5. 2209
  6. 5476
  7. 2304
  8. 8836
  9. 4225
  10. 3721
  11. 9025
  12. 1369
  13. 1225
  14. 4489
  15. 7396
  16. 4624
  17. 1764
  18. 3844
  19. 6084
  20. 2401
  21. 8649
  22. 7744
  23. 1681
  24. 4356
  25. 7225
  26. 8281
  27. 6241
  28. 1444
  29. 2025
  30. 5329
  31. 7569
  32. 4761
  33. 3136
  34. 5929
  35. 2704
  36. 1156
  37. 7056
  38. 2601
  39. 6561
  40. 6724

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