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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 840 · 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. 1.31² =
  2. 2.62² =
  3. 3.48² =
  4. 4.51² =
  5. 5.95² =
  6. 6.49² =
  7. 7.64² =
  8. 8.38² =
  9. 9.78² =
  10. 10.46² =
  11. 11.89² =
  12. 12.71² =
  13. 13.92² =
  14. 14.56² =
  15. 15.77² =
  16. 16.83² =
  17. 17.81² =
  18. 18.57² =
  19. 19.65² =
  20. 20.41² =
  21. 21.33² =
  22. 22.36² =
  23. 23.66² =
  24. 24.87² =
  25. 25.39² =
  26. 26.91² =
  27. 27.76² =
  28. 28.79² =
  29. 29.34² =
  30. 30.44² =
  31. 31.94² =
  32. 32.74² =
  33. 33.69² =
  34. 34.43² =
  35. 35.97² =
  36. 36.52² =
  37. 37.53² =
  38. 38.73² =
  39. 39.72² =
  40. 40.32² =

Answer key

  1. 961
  2. 3844
  3. 2304
  4. 2601
  5. 9025
  6. 2401
  7. 4096
  8. 1444
  9. 6084
  10. 2116
  11. 7921
  12. 5041
  13. 8464
  14. 3136
  15. 5929
  16. 6889
  17. 6561
  18. 3249
  19. 4225
  20. 1681
  21. 1089
  22. 1296
  23. 4356
  24. 7569
  25. 1521
  26. 8281
  27. 5776
  28. 6241
  29. 1156
  30. 1936
  31. 8836
  32. 5476
  33. 4761
  34. 1849
  35. 9409
  36. 2704
  37. 2809
  38. 5329
  39. 5184
  40. 1024

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