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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 921 · 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. 1.71² =
  2. 2.63² =
  3. 3.72² =
  4. 4.52² =
  5. 5.34² =
  6. 6.58² =
  7. 7.39² =
  8. 8.44² =
  9. 9.84² =
  10. 10.45² =
  11. 11.51² =
  12. 12.66² =
  13. 13.56² =
  14. 14.67² =
  15. 15.96² =
  16. 16.78² =
  17. 17.98² =
  18. 18.65² =
  19. 19.49² =
  20. 20.55² =
  21. 21.89² =
  22. 22.43² =
  23. 23.97² =
  24. 24.32² =
  25. 25.46² =
  26. 26.48² =
  27. 27.69² =
  28. 28.77² =
  29. 29.76² =
  30. 30.42² =
  31. 31.41² =
  32. 32.38² =
  33. 33.81² =
  34. 34.74² =
  35. 35.92² =
  36. 36.99² =
  37. 37.85² =
  38. 38.47² =
  39. 39.36² =
  40. 40.91² =

Answer key

  1. 5041
  2. 3969
  3. 5184
  4. 2704
  5. 1156
  6. 3364
  7. 1521
  8. 1936
  9. 7056
  10. 2025
  11. 2601
  12. 4356
  13. 3136
  14. 4489
  15. 9216
  16. 6084
  17. 9604
  18. 4225
  19. 2401
  20. 3025
  21. 7921
  22. 1849
  23. 9409
  24. 1024
  25. 2116
  26. 2304
  27. 4761
  28. 5929
  29. 5776
  30. 1764
  31. 1681
  32. 1444
  33. 6561
  34. 5476
  35. 8464
  36. 9801
  37. 7225
  38. 2209
  39. 1296
  40. 8281

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