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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 15 · 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. 1.44² =
  2. 2.33² =
  3. 3.66² =
  4. 4.61² =
  5. 5.58² =
  6. 6.38² =
  7. 7.43² =
  8. 8.78² =
  9. 9.57² =
  10. 10.77² =
  11. 11.54² =
  12. 12.82² =
  13. 13.79² =
  14. 14.81² =
  15. 15.99² =
  16. 16.92² =
  17. 17.39² =
  18. 18.31² =
  19. 19.94² =
  20. 20.83² =
  21. 21.46² =
  22. 22.91² =
  23. 23.86² =
  24. 24.64² =
  25. 25.41² =
  26. 26.45² =
  27. 27.34² =
  28. 28.93² =
  29. 29.87² =
  30. 30.37² =
  31. 31.67² =
  32. 32.49² =
  33. 33.97² =
  34. 34.69² =
  35. 35.36² =
  36. 36.51² =
  37. 37.48² =
  38. 38.53² =
  39. 39.65² =
  40. 40.52² =

Answer key

  1. 1936
  2. 1089
  3. 4356
  4. 3721
  5. 3364
  6. 1444
  7. 1849
  8. 6084
  9. 3249
  10. 5929
  11. 2916
  12. 6724
  13. 6241
  14. 6561
  15. 9801
  16. 8464
  17. 1521
  18. 961
  19. 8836
  20. 6889
  21. 2116
  22. 8281
  23. 7396
  24. 4096
  25. 1681
  26. 2025
  27. 1156
  28. 8649
  29. 7569
  30. 1369
  31. 4489
  32. 2401
  33. 9409
  34. 4761
  35. 1296
  36. 2601
  37. 2304
  38. 2809
  39. 4225
  40. 2704

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