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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 151 · 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. 1.72² =
  2. 2.67² =
  3. 3.64² =
  4. 4.46² =
  5. 5.68² =
  6. 6.81² =
  7. 7.63² =
  8. 8.88² =
  9. 9.39² =
  10. 10.51² =
  11. 11.35² =
  12. 12.86² =
  13. 13.56² =
  14. 14.34² =
  15. 15.43² =
  16. 16.44² =
  17. 17.47² =
  18. 18.77² =
  19. 19.84² =
  20. 20.62² =
  21. 21.65² =
  22. 22.71² =
  23. 23.91² =
  24. 24.36² =
  25. 25.32² =
  26. 26.66² =
  27. 27.93² =
  28. 28.48² =
  29. 29.55² =
  30. 30.38² =
  31. 31.33² =
  32. 32.97² =
  33. 33.41² =
  34. 34.73² =
  35. 35.53² =
  36. 36.82² =
  37. 37.52² =
  38. 38.49² =
  39. 39.61² =
  40. 40.45² =

Answer key

  1. 5184
  2. 4489
  3. 4096
  4. 2116
  5. 4624
  6. 6561
  7. 3969
  8. 7744
  9. 1521
  10. 2601
  11. 1225
  12. 7396
  13. 3136
  14. 1156
  15. 1849
  16. 1936
  17. 2209
  18. 5929
  19. 7056
  20. 3844
  21. 4225
  22. 5041
  23. 8281
  24. 1296
  25. 1024
  26. 4356
  27. 8649
  28. 2304
  29. 3025
  30. 1444
  31. 1089
  32. 9409
  33. 1681
  34. 5329
  35. 2809
  36. 6724
  37. 2704
  38. 2401
  39. 3721
  40. 2025

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