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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 925 · 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. 1.61² =
  2. 2.69² =
  3. 3.32² =
  4. 4.86² =
  5. 5.81² =
  6. 6.43² =
  7. 7.76² =
  8. 8.64² =
  9. 9.97² =
  10. 10.87² =
  11. 11.95² =
  12. 12.39² =
  13. 13.77² =
  14. 14.63² =
  15. 15.65² =
  16. 16.96² =
  17. 17.83² =
  18. 18.74² =
  19. 19.59² =
  20. 20.51² =
  21. 21.71² =
  22. 22.37² =
  23. 23.36² =
  24. 24.47² =
  25. 25.78² =
  26. 26.58² =
  27. 27.31² =
  28. 28.46² =
  29. 29.53² =
  30. 30.49² =
  31. 31.67² =
  32. 32.66² =
  33. 33.38² =
  34. 34.88² =
  35. 35.73² =
  36. 36.79² =
  37. 37.56² =
  38. 38.48² =
  39. 39.92² =
  40. 40.84² =

Answer key

  1. 3721
  2. 4761
  3. 1024
  4. 7396
  5. 6561
  6. 1849
  7. 5776
  8. 4096
  9. 9409
  10. 7569
  11. 9025
  12. 1521
  13. 5929
  14. 3969
  15. 4225
  16. 9216
  17. 6889
  18. 5476
  19. 3481
  20. 2601
  21. 5041
  22. 1369
  23. 1296
  24. 2209
  25. 6084
  26. 3364
  27. 961
  28. 2116
  29. 2809
  30. 2401
  31. 4489
  32. 4356
  33. 1444
  34. 7744
  35. 5329
  36. 6241
  37. 3136
  38. 2304
  39. 8464
  40. 7056

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