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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 179 · 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. 1.57² =
  2. 2.84² =
  3. 3.72² =
  4. 4.32² =
  5. 5.34² =
  6. 6.73² =
  7. 7.61² =
  8. 8.67² =
  9. 9.63² =
  10. 10.78² =
  11. 11.49² =
  12. 12.35² =
  13. 13.76² =
  14. 14.91² =
  15. 15.68² =
  16. 16.37² =
  17. 17.77² =
  18. 18.56² =
  19. 19.62² =
  20. 20.51² =
  21. 21.82² =
  22. 22.41² =
  23. 23.89² =
  24. 24.75² =
  25. 25.66² =
  26. 26.48² =
  27. 27.96² =
  28. 28.38² =
  29. 29.47² =
  30. 30.81² =
  31. 31.99² =
  32. 32.65² =
  33. 33.71² =
  34. 34.59² =
  35. 35.46² =
  36. 36.64² =
  37. 37.36² =
  38. 38.86² =
  39. 39.55² =
  40. 40.79² =

Answer key

  1. 3249
  2. 7056
  3. 5184
  4. 1024
  5. 1156
  6. 5329
  7. 3721
  8. 4489
  9. 3969
  10. 6084
  11. 2401
  12. 1225
  13. 5776
  14. 8281
  15. 4624
  16. 1369
  17. 5929
  18. 3136
  19. 3844
  20. 2601
  21. 6724
  22. 1681
  23. 7921
  24. 5625
  25. 4356
  26. 2304
  27. 9216
  28. 1444
  29. 2209
  30. 6561
  31. 9801
  32. 4225
  33. 5041
  34. 3481
  35. 2116
  36. 4096
  37. 1296
  38. 7396
  39. 3025
  40. 6241

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