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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 968 · 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. 1.43² =
  2. 2.61² =
  3. 3.98² =
  4. 4.92² =
  5. 5.47² =
  6. 6.39² =
  7. 7.31² =
  8. 8.94² =
  9. 9.97² =
  10. 10.66² =
  11. 11.58² =
  12. 12.82² =
  13. 13.65² =
  14. 14.74² =
  15. 15.85² =
  16. 16.68² =
  17. 17.78² =
  18. 18.57² =
  19. 19.41² =
  20. 20.91² =
  21. 21.67² =
  22. 22.73² =
  23. 23.87² =
  24. 24.99² =
  25. 25.48² =
  26. 26.34² =
  27. 27.96² =
  28. 28.64² =
  29. 29.62² =
  30. 30.75² =
  31. 31.33² =
  32. 32.36² =
  33. 33.63² =
  34. 34.51² =
  35. 35.38² =
  36. 36.45² =
  37. 37.52² =
  38. 38.71² =
  39. 39.35² =
  40. 40.42² =

Answer key

  1. 1849
  2. 3721
  3. 9604
  4. 8464
  5. 2209
  6. 1521
  7. 961
  8. 8836
  9. 9409
  10. 4356
  11. 3364
  12. 6724
  13. 4225
  14. 5476
  15. 7225
  16. 4624
  17. 6084
  18. 3249
  19. 1681
  20. 8281
  21. 4489
  22. 5329
  23. 7569
  24. 9801
  25. 2304
  26. 1156
  27. 9216
  28. 4096
  29. 3844
  30. 5625
  31. 1089
  32. 1296
  33. 3969
  34. 2601
  35. 1444
  36. 2025
  37. 2704
  38. 5041
  39. 1225
  40. 1764

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