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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 852 · 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. 1.96² =
  2. 2.43² =
  3. 3.39² =
  4. 4.95² =
  5. 5.91² =
  6. 6.51² =
  7. 7.48² =
  8. 8.41² =
  9. 9.38² =
  10. 10.35² =
  11. 11.66² =
  12. 12.67² =
  13. 13.97² =
  14. 14.46² =
  15. 15.31² =
  16. 16.82² =
  17. 17.75² =
  18. 18.69² =
  19. 19.53² =
  20. 20.34² =
  21. 21.85² =
  22. 22.79² =
  23. 23.92² =
  24. 24.55² =
  25. 25.89² =
  26. 26.61² =
  27. 27.73² =
  28. 28.99² =
  29. 29.44² =
  30. 30.33² =
  31. 31.58² =
  32. 32.78² =
  33. 33.94² =
  34. 34.62² =
  35. 35.35² =
  36. 36.76² =
  37. 37.32² =
  38. 38.45² =
  39. 39.81² =
  40. 40.77² =

Answer key

  1. 9216
  2. 1849
  3. 1521
  4. 9025
  5. 8281
  6. 2601
  7. 2304
  8. 1681
  9. 1444
  10. 1225
  11. 4356
  12. 4489
  13. 9409
  14. 2116
  15. 961
  16. 6724
  17. 5625
  18. 4761
  19. 2809
  20. 1156
  21. 7225
  22. 6241
  23. 8464
  24. 3025
  25. 7921
  26. 3721
  27. 5329
  28. 9801
  29. 1936
  30. 1089
  31. 3364
  32. 6084
  33. 8836
  34. 3844
  35. 1225
  36. 5776
  37. 1024
  38. 2025
  39. 6561
  40. 5929

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