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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 913 · 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. 2.81² =
  3. 3.51² =
  4. 4.96² =
  5. 5.82² =
  6. 6.59² =
  7. 7.95² =
  8. 8.33² =
  9. 9.97² =
  10. 10.39² =
  11. 11.58² =
  12. 12.48² =
  13. 13.98² =
  14. 14.68² =
  15. 15.65² =
  16. 16.71² =
  17. 17.36² =
  18. 18.35² =
  19. 19.72² =
  20. 20.73² =
  21. 21.41² =
  22. 22.61² =
  23. 23.66² =
  24. 24.32² =
  25. 25.53² =
  26. 26.64² =
  27. 27.91² =
  28. 28.42² =
  29. 29.93² =
  30. 30.52² =
  31. 31.87² =
  32. 32.46² =
  33. 33.79² =
  34. 34.49² =
  35. 35.57² =
  36. 36.76² =
  37. 37.34² =
  38. 38.89² =
  39. 39.92² =
  40. 40.74² =

Answer key

  1. 2916
  2. 6561
  3. 2601
  4. 9216
  5. 6724
  6. 3481
  7. 9025
  8. 1089
  9. 9409
  10. 1521
  11. 3364
  12. 2304
  13. 9604
  14. 4624
  15. 4225
  16. 5041
  17. 1296
  18. 1225
  19. 5184
  20. 5329
  21. 1681
  22. 3721
  23. 4356
  24. 1024
  25. 2809
  26. 4096
  27. 8281
  28. 1764
  29. 8649
  30. 2704
  31. 7569
  32. 2116
  33. 6241
  34. 2401
  35. 3249
  36. 5776
  37. 1156
  38. 7921
  39. 8464
  40. 5476

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