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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 134 · 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. 1.64² =
  2. 2.38² =
  3. 3.48² =
  4. 4.76² =
  5. 5.86² =
  6. 6.41² =
  7. 7.82² =
  8. 8.54² =
  9. 9.71² =
  10. 10.42² =
  11. 11.65² =
  12. 12.66² =
  13. 13.94² =
  14. 14.44² =
  15. 15.97² =
  16. 16.93² =
  17. 17.73² =
  18. 18.96² =
  19. 19.45² =
  20. 20.32² =
  21. 21.31² =
  22. 22.79² =
  23. 23.69² =
  24. 24.91² =
  25. 25.62² =
  26. 26.51² =
  27. 27.68² =
  28. 28.46² =
  29. 29.81² =
  30. 30.39² =
  31. 31.99² =
  32. 32.85² =
  33. 33.49² =
  34. 34.47² =
  35. 35.37² =
  36. 36.55² =
  37. 37.98² =
  38. 38.92² =
  39. 39.75² =
  40. 40.87² =

Answer key

  1. 4096
  2. 1444
  3. 2304
  4. 5776
  5. 7396
  6. 1681
  7. 6724
  8. 2916
  9. 5041
  10. 1764
  11. 4225
  12. 4356
  13. 8836
  14. 1936
  15. 9409
  16. 8649
  17. 5329
  18. 9216
  19. 2025
  20. 1024
  21. 961
  22. 6241
  23. 4761
  24. 8281
  25. 3844
  26. 2601
  27. 4624
  28. 2116
  29. 6561
  30. 1521
  31. 9801
  32. 7225
  33. 2401
  34. 2209
  35. 1369
  36. 3025
  37. 9604
  38. 8464
  39. 5625
  40. 7569

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