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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 638 · 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. 1.76² =
  2. 2.67² =
  3. 3.77² =
  4. 4.93² =
  5. 5.89² =
  6. 6.73² =
  7. 7.75² =
  8. 8.44² =
  9. 9.33² =
  10. 10.72² =
  11. 11.61² =
  12. 12.52² =
  13. 13.56² =
  14. 14.55² =
  15. 15.48² =
  16. 16.47² =
  17. 17.38² =
  18. 18.32² =
  19. 19.37² =
  20. 20.71² =
  21. 21.57² =
  22. 22.34² =
  23. 23.65² =
  24. 24.92² =
  25. 25.91² =
  26. 26.97² =
  27. 27.99² =
  28. 28.41² =
  29. 29.64² =
  30. 30.86² =
  31. 31.68² =
  32. 32.51² =
  33. 33.96² =
  34. 34.49² =
  35. 35.43² =
  36. 36.74² =
  37. 37.46² =
  38. 38.36² =
  39. 39.66² =
  40. 40.39² =

Answer key

  1. 5776
  2. 4489
  3. 5929
  4. 8649
  5. 7921
  6. 5329
  7. 5625
  8. 1936
  9. 1089
  10. 5184
  11. 3721
  12. 2704
  13. 3136
  14. 3025
  15. 2304
  16. 2209
  17. 1444
  18. 1024
  19. 1369
  20. 5041
  21. 3249
  22. 1156
  23. 4225
  24. 8464
  25. 8281
  26. 9409
  27. 9801
  28. 1681
  29. 4096
  30. 7396
  31. 4624
  32. 2601
  33. 9216
  34. 2401
  35. 1849
  36. 5476
  37. 2116
  38. 1296
  39. 4356
  40. 1521

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