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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 884 · 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. 1.74² =
  2. 2.81² =
  3. 3.33² =
  4. 4.45² =
  5. 5.39² =
  6. 6.46² =
  7. 7.91² =
  8. 8.51² =
  9. 9.65² =
  10. 10.53² =
  11. 11.66² =
  12. 12.34² =
  13. 13.77² =
  14. 14.97² =
  15. 15.94² =
  16. 16.38² =
  17. 17.32² =
  18. 18.73² =
  19. 19.68² =
  20. 20.64² =
  21. 21.44² =
  22. 22.69² =
  23. 23.43² =
  24. 24.71² =
  25. 25.48² =
  26. 26.88² =
  27. 27.47² =
  28. 28.72² =
  29. 29.83² =
  30. 30.59² =
  31. 31.61² =
  32. 32.89² =
  33. 33.67² =
  34. 34.54² =
  35. 35.98² =
  36. 36.99² =
  37. 37.92² =
  38. 38.41² =
  39. 39.56² =
  40. 40.36² =

Answer key

  1. 5476
  2. 6561
  3. 1089
  4. 2025
  5. 1521
  6. 2116
  7. 8281
  8. 2601
  9. 4225
  10. 2809
  11. 4356
  12. 1156
  13. 5929
  14. 9409
  15. 8836
  16. 1444
  17. 1024
  18. 5329
  19. 4624
  20. 4096
  21. 1936
  22. 4761
  23. 1849
  24. 5041
  25. 2304
  26. 7744
  27. 2209
  28. 5184
  29. 6889
  30. 3481
  31. 3721
  32. 7921
  33. 4489
  34. 2916
  35. 9604
  36. 9801
  37. 8464
  38. 1681
  39. 3136
  40. 1296

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