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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 433 · 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. 2.74² =
  3. 3.78² =
  4. 4.64² =
  5. 5.86² =
  6. 6.77² =
  7. 7.38² =
  8. 8.58² =
  9. 9.47² =
  10. 10.85² =
  11. 11.44² =
  12. 12.36² =
  13. 13.34² =
  14. 14.51² =
  15. 15.45² =
  16. 16.89² =
  17. 17.43² =
  18. 18.84² =
  19. 19.91² =
  20. 20.57² =
  21. 21.75² =
  22. 22.79² =
  23. 23.54² =
  24. 24.98² =
  25. 25.95² =
  26. 26.99² =
  27. 27.41² =
  28. 28.88² =
  29. 29.67² =
  30. 30.71² =
  31. 31.96² =
  32. 32.48² =
  33. 33.61² =
  34. 34.49² =
  35. 35.52² =
  36. 36.83² =
  37. 37.32² =
  38. 38.35² =
  39. 39.56² =
  40. 40.81² =

Answer key

  1. 5184
  2. 5476
  3. 6084
  4. 4096
  5. 7396
  6. 5929
  7. 1444
  8. 3364
  9. 2209
  10. 7225
  11. 1936
  12. 1296
  13. 1156
  14. 2601
  15. 2025
  16. 7921
  17. 1849
  18. 7056
  19. 8281
  20. 3249
  21. 5625
  22. 6241
  23. 2916
  24. 9604
  25. 9025
  26. 9801
  27. 1681
  28. 7744
  29. 4489
  30. 5041
  31. 9216
  32. 2304
  33. 3721
  34. 2401
  35. 2704
  36. 6889
  37. 1024
  38. 1225
  39. 3136
  40. 6561

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