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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 693 · 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. 1.94² =
  2. 2.74² =
  3. 3.79² =
  4. 4.91² =
  5. 5.38² =
  6. 6.98² =
  7. 7.86² =
  8. 8.42² =
  9. 9.31² =
  10. 10.64² =
  11. 11.62² =
  12. 12.37² =
  13. 13.54² =
  14. 14.66² =
  15. 15.97² =
  16. 16.53² =
  17. 17.51² =
  18. 18.84² =
  19. 19.43² =
  20. 20.81² =
  21. 21.45² =
  22. 22.93² =
  23. 23.82² =
  24. 24.48² =
  25. 25.99² =
  26. 26.49² =
  27. 27.56² =
  28. 28.78² =
  29. 29.59² =
  30. 30.75² =
  31. 31.36² =
  32. 32.83² =
  33. 33.57² =
  34. 34.69² =
  35. 35.41² =
  36. 36.32² =
  37. 37.47² =
  38. 38.61² =
  39. 39.71² =
  40. 40.35² =

Answer key

  1. 8836
  2. 5476
  3. 6241
  4. 8281
  5. 1444
  6. 9604
  7. 7396
  8. 1764
  9. 961
  10. 4096
  11. 3844
  12. 1369
  13. 2916
  14. 4356
  15. 9409
  16. 2809
  17. 2601
  18. 7056
  19. 1849
  20. 6561
  21. 2025
  22. 8649
  23. 6724
  24. 2304
  25. 9801
  26. 2401
  27. 3136
  28. 6084
  29. 3481
  30. 5625
  31. 1296
  32. 6889
  33. 3249
  34. 4761
  35. 1681
  36. 1024
  37. 2209
  38. 3721
  39. 5041
  40. 1225

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