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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 430 · 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. 1.73² =
  2. 2.67² =
  3. 3.48² =
  4. 4.89² =
  5. 5.32² =
  6. 6.56² =
  7. 7.47² =
  8. 8.82² =
  9. 9.34² =
  10. 10.76² =
  11. 11.71² =
  12. 12.39² =
  13. 13.41² =
  14. 14.61² =
  15. 15.45² =
  16. 16.42² =
  17. 17.64² =
  18. 18.72² =
  19. 19.63² =
  20. 20.96² =
  21. 21.97² =
  22. 22.68² =
  23. 23.44² =
  24. 24.49² =
  25. 25.62² =
  26. 26.37² =
  27. 27.51² =
  28. 28.36² =
  29. 29.93² =
  30. 30.91² =
  31. 31.66² =
  32. 32.81² =
  33. 33.75² =
  34. 34.46² =
  35. 35.43² =
  36. 36.99² =
  37. 37.84² =
  38. 38.54² =
  39. 39.33² =
  40. 40.58² =

Answer key

  1. 5329
  2. 4489
  3. 2304
  4. 7921
  5. 1024
  6. 3136
  7. 2209
  8. 6724
  9. 1156
  10. 5776
  11. 5041
  12. 1521
  13. 1681
  14. 3721
  15. 2025
  16. 1764
  17. 4096
  18. 5184
  19. 3969
  20. 9216
  21. 9409
  22. 4624
  23. 1936
  24. 2401
  25. 3844
  26. 1369
  27. 2601
  28. 1296
  29. 8649
  30. 8281
  31. 4356
  32. 6561
  33. 5625
  34. 2116
  35. 1849
  36. 9801
  37. 7056
  38. 2916
  39. 1089
  40. 3364

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