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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 250 · 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. 1.53² =
  2. 2.43² =
  3. 3.38² =
  4. 4.48² =
  5. 5.79² =
  6. 6.93² =
  7. 7.47² =
  8. 8.68² =
  9. 9.81² =
  10. 10.56² =
  11. 11.91² =
  12. 12.94² =
  13. 13.34² =
  14. 14.46² =
  15. 15.36² =
  16. 16.84² =
  17. 17.82² =
  18. 18.33² =
  19. 19.71² =
  20. 20.63² =
  21. 21.41² =
  22. 22.78² =
  23. 23.42² =
  24. 24.77² =
  25. 25.89² =
  26. 26.86² =
  27. 27.35² =
  28. 28.87² =
  29. 29.55² =
  30. 30.32² =
  31. 31.31² =
  32. 32.66² =
  33. 33.54² =
  34. 34.99² =
  35. 35.76² =
  36. 36.61² =
  37. 37.51² =
  38. 38.62² =
  39. 39.95² =
  40. 40.64² =

Answer key

  1. 2809
  2. 1849
  3. 1444
  4. 2304
  5. 6241
  6. 8649
  7. 2209
  8. 4624
  9. 6561
  10. 3136
  11. 8281
  12. 8836
  13. 1156
  14. 2116
  15. 1296
  16. 7056
  17. 6724
  18. 1089
  19. 5041
  20. 3969
  21. 1681
  22. 6084
  23. 1764
  24. 5929
  25. 7921
  26. 7396
  27. 1225
  28. 7569
  29. 3025
  30. 1024
  31. 961
  32. 4356
  33. 2916
  34. 9801
  35. 5776
  36. 3721
  37. 2601
  38. 3844
  39. 9025
  40. 4096

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