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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 944 · 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. 2.91² =
  3. 3.59² =
  4. 4.71² =
  5. 5.36² =
  6. 6.33² =
  7. 7.98² =
  8. 8.48² =
  9. 9.57² =
  10. 10.55² =
  11. 11.37² =
  12. 12.87² =
  13. 13.81² =
  14. 14.39² =
  15. 15.86² =
  16. 16.49² =
  17. 17.93² =
  18. 18.78² =
  19. 19.32² =
  20. 20.96² =
  21. 21.77² =
  22. 22.64² =
  23. 23.52² =
  24. 24.88² =
  25. 25.51² =
  26. 26.45² =
  27. 27.62² =
  28. 28.66² =
  29. 29.94² =
  30. 30.43² =
  31. 31.97² =
  32. 32.44² =
  33. 33.46² =
  34. 34.61² =
  35. 35.92² =
  36. 36.38² =
  37. 37.83² =
  38. 38.89² =
  39. 39.41² =
  40. 40.74² =

Answer key

  1. 2916
  2. 8281
  3. 3481
  4. 5041
  5. 1296
  6. 1089
  7. 9604
  8. 2304
  9. 3249
  10. 3025
  11. 1369
  12. 7569
  13. 6561
  14. 1521
  15. 7396
  16. 2401
  17. 8649
  18. 6084
  19. 1024
  20. 9216
  21. 5929
  22. 4096
  23. 2704
  24. 7744
  25. 2601
  26. 2025
  27. 3844
  28. 4356
  29. 8836
  30. 1849
  31. 9409
  32. 1936
  33. 2116
  34. 3721
  35. 8464
  36. 1444
  37. 6889
  38. 7921
  39. 1681
  40. 5476

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