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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 845 · 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. 1.97² =
  2. 2.49² =
  3. 3.58² =
  4. 4.95² =
  5. 5.71² =
  6. 6.99² =
  7. 7.61² =
  8. 8.48² =
  9. 9.45² =
  10. 10.75² =
  11. 11.33² =
  12. 12.78² =
  13. 13.64² =
  14. 14.57² =
  15. 15.41² =
  16. 16.73² =
  17. 17.37² =
  18. 18.89² =
  19. 19.76² =
  20. 20.77² =
  21. 21.98² =
  22. 22.88² =
  23. 23.55² =
  24. 24.56² =
  25. 25.79² =
  26. 26.87² =
  27. 27.83² =
  28. 28.36² =
  29. 29.51² =
  30. 30.68² =
  31. 31.84² =
  32. 32.91² =
  33. 33.66² =
  34. 34.42² =
  35. 35.54² =
  36. 36.81² =
  37. 37.38² =
  38. 38.74² =
  39. 39.43² =
  40. 40.46² =

Answer key

  1. 9409
  2. 2401
  3. 3364
  4. 9025
  5. 5041
  6. 9801
  7. 3721
  8. 2304
  9. 2025
  10. 5625
  11. 1089
  12. 6084
  13. 4096
  14. 3249
  15. 1681
  16. 5329
  17. 1369
  18. 7921
  19. 5776
  20. 5929
  21. 9604
  22. 7744
  23. 3025
  24. 3136
  25. 6241
  26. 7569
  27. 6889
  28. 1296
  29. 2601
  30. 4624
  31. 7056
  32. 8281
  33. 4356
  34. 1764
  35. 2916
  36. 6561
  37. 1444
  38. 5476
  39. 1849
  40. 2116

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