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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 973 · 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. 1.35² =
  2. 2.95² =
  3. 3.33² =
  4. 4.52² =
  5. 5.77² =
  6. 6.42² =
  7. 7.41² =
  8. 8.73² =
  9. 9.93² =
  10. 10.58² =
  11. 11.38² =
  12. 12.82² =
  13. 13.43² =
  14. 14.51² =
  15. 15.44² =
  16. 16.84² =
  17. 17.32² =
  18. 18.53² =
  19. 19.66² =
  20. 20.45² =
  21. 21.55² =
  22. 22.39² =
  23. 23.74² =
  24. 24.37² =
  25. 25.99² =
  26. 26.91² =
  27. 27.78² =
  28. 28.61² =
  29. 29.46² =
  30. 30.48² =
  31. 31.75² =
  32. 32.85² =
  33. 33.92² =
  34. 34.97² =
  35. 35.96² =
  36. 36.72² =
  37. 37.83² =
  38. 38.67² =
  39. 39.87² =
  40. 40.64² =

Answer key

  1. 1225
  2. 9025
  3. 1089
  4. 2704
  5. 5929
  6. 1764
  7. 1681
  8. 5329
  9. 8649
  10. 3364
  11. 1444
  12. 6724
  13. 1849
  14. 2601
  15. 1936
  16. 7056
  17. 1024
  18. 2809
  19. 4356
  20. 2025
  21. 3025
  22. 1521
  23. 5476
  24. 1369
  25. 9801
  26. 8281
  27. 6084
  28. 3721
  29. 2116
  30. 2304
  31. 5625
  32. 7225
  33. 8464
  34. 9409
  35. 9216
  36. 5184
  37. 6889
  38. 4489
  39. 7569
  40. 4096

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