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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 991 · 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. 1.54² =
  2. 2.49² =
  3. 3.76² =
  4. 4.82² =
  5. 5.74² =
  6. 6.98² =
  7. 7.83² =
  8. 8.71² =
  9. 9.59² =
  10. 10.97² =
  11. 11.39² =
  12. 12.69² =
  13. 13.46² =
  14. 14.89² =
  15. 15.99² =
  16. 16.64² =
  17. 17.51² =
  18. 18.62² =
  19. 19.86² =
  20. 20.48² =
  21. 21.43² =
  22. 22.63² =
  23. 23.33² =
  24. 24.75² =
  25. 25.42² =
  26. 26.56² =
  27. 27.73² =
  28. 28.85² =
  29. 29.81² =
  30. 30.68² =
  31. 31.41² =
  32. 32.38² =
  33. 33.61² =
  34. 34.87² =
  35. 35.95² =
  36. 36.66² =
  37. 37.45² =
  38. 38.67² =
  39. 39.72² =
  40. 40.93² =

Answer key

  1. 2916
  2. 2401
  3. 5776
  4. 6724
  5. 5476
  6. 9604
  7. 6889
  8. 5041
  9. 3481
  10. 9409
  11. 1521
  12. 4761
  13. 2116
  14. 7921
  15. 9801
  16. 4096
  17. 2601
  18. 3844
  19. 7396
  20. 2304
  21. 1849
  22. 3969
  23. 1089
  24. 5625
  25. 1764
  26. 3136
  27. 5329
  28. 7225
  29. 6561
  30. 4624
  31. 1681
  32. 1444
  33. 3721
  34. 7569
  35. 9025
  36. 4356
  37. 2025
  38. 4489
  39. 5184
  40. 8649

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