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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 389 · 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. 1.81² =
  2. 2.44² =
  3. 3.38² =
  4. 4.36² =
  5. 5.86² =
  6. 6.42² =
  7. 7.43² =
  8. 8.79² =
  9. 9.51² =
  10. 10.48² =
  11. 11.87² =
  12. 12.72² =
  13. 13.92² =
  14. 14.93² =
  15. 15.54² =
  16. 16.64² =
  17. 17.63² =
  18. 18.75² =
  19. 19.68² =
  20. 20.46² =
  21. 21.61² =
  22. 22.55² =
  23. 23.37² =
  24. 24.67² =
  25. 25.88² =
  26. 26.95² =
  27. 27.34² =
  28. 28.57² =
  29. 29.32² =
  30. 30.99² =
  31. 31.97² =
  32. 32.39² =
  33. 33.76² =
  34. 34.66² =
  35. 35.94² =
  36. 36.53² =
  37. 37.65² =
  38. 38.71² =
  39. 39.84² =
  40. 40.45² =

Answer key

  1. 6561
  2. 1936
  3. 1444
  4. 1296
  5. 7396
  6. 1764
  7. 1849
  8. 6241
  9. 2601
  10. 2304
  11. 7569
  12. 5184
  13. 8464
  14. 8649
  15. 2916
  16. 4096
  17. 3969
  18. 5625
  19. 4624
  20. 2116
  21. 3721
  22. 3025
  23. 1369
  24. 4489
  25. 7744
  26. 9025
  27. 1156
  28. 3249
  29. 1024
  30. 9801
  31. 9409
  32. 1521
  33. 5776
  34. 4356
  35. 8836
  36. 2809
  37. 4225
  38. 5041
  39. 7056
  40. 2025

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