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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 10 · 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. 1.78² =
  2. 2.39² =
  3. 3.91² =
  4. 4.86² =
  5. 5.72² =
  6. 6.77² =
  7. 7.34² =
  8. 8.66² =
  9. 9.31² =
  10. 10.49² =
  11. 11.59² =
  12. 12.71² =
  13. 13.61² =
  14. 14.41² =
  15. 15.81² =
  16. 16.83² =
  17. 17.47² =
  18. 18.35² =
  19. 19.64² =
  20. 20.48² =
  21. 21.75² =
  22. 22.53² =
  23. 23.51² =
  24. 24.88² =
  25. 25.93² =
  26. 26.56² =
  27. 27.52² =
  28. 28.46² =
  29. 29.99² =
  30. 30.85² =
  31. 31.33² =
  32. 32.89² =
  33. 33.96² =
  34. 34.76² =
  35. 35.84² =
  36. 36.92² =
  37. 37.43² =
  38. 38.32² =
  39. 39.82² =
  40. 40.71² =

Answer key

  1. 6084
  2. 1521
  3. 8281
  4. 7396
  5. 5184
  6. 5929
  7. 1156
  8. 4356
  9. 961
  10. 2401
  11. 3481
  12. 5041
  13. 3721
  14. 1681
  15. 6561
  16. 6889
  17. 2209
  18. 1225
  19. 4096
  20. 2304
  21. 5625
  22. 2809
  23. 2601
  24. 7744
  25. 8649
  26. 3136
  27. 2704
  28. 2116
  29. 9801
  30. 7225
  31. 1089
  32. 7921
  33. 9216
  34. 5776
  35. 7056
  36. 8464
  37. 1849
  38. 1024
  39. 6724
  40. 5041

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