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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 858 · 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. 1.99² =
  2. 2.48² =
  3. 3.94² =
  4. 4.96² =
  5. 5.45² =
  6. 6.84² =
  7. 7.41² =
  8. 8.92² =
  9. 9.57² =
  10. 10.33² =
  11. 11.34² =
  12. 12.62² =
  13. 13.72² =
  14. 14.83² =
  15. 15.91² =
  16. 16.38² =
  17. 17.69² =
  18. 18.82² =
  19. 19.52² =
  20. 20.67² =
  21. 21.97² =
  22. 22.56² =
  23. 23.81² =
  24. 24.98² =
  25. 25.47² =
  26. 26.43² =
  27. 27.46² =
  28. 28.71² =
  29. 29.89² =
  30. 30.73² =
  31. 31.88² =
  32. 32.54² =
  33. 33.44² =
  34. 34.77² =
  35. 35.76² =
  36. 36.39² =
  37. 37.49² =
  38. 38.74² =
  39. 39.75² =
  40. 40.61² =

Answer key

  1. 9801
  2. 2304
  3. 8836
  4. 9216
  5. 2025
  6. 7056
  7. 1681
  8. 8464
  9. 3249
  10. 1089
  11. 1156
  12. 3844
  13. 5184
  14. 6889
  15. 8281
  16. 1444
  17. 4761
  18. 6724
  19. 2704
  20. 4489
  21. 9409
  22. 3136
  23. 6561
  24. 9604
  25. 2209
  26. 1849
  27. 2116
  28. 5041
  29. 7921
  30. 5329
  31. 7744
  32. 2916
  33. 1936
  34. 5929
  35. 5776
  36. 1521
  37. 2401
  38. 5476
  39. 5625
  40. 3721

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