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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 582 · 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. 1.46² =
  2. 2.92² =
  3. 3.69² =
  4. 4.42² =
  5. 5.37² =
  6. 6.81² =
  7. 7.68² =
  8. 8.77² =
  9. 9.47² =
  10. 10.38² =
  11. 11.33² =
  12. 12.66² =
  13. 13.71² =
  14. 14.89² =
  15. 15.31² =
  16. 16.54² =
  17. 17.48² =
  18. 18.97² =
  19. 19.45² =
  20. 20.44² =
  21. 21.96² =
  22. 22.41² =
  23. 23.39² =
  24. 24.49² =
  25. 25.51² =
  26. 26.87² =
  27. 27.98² =
  28. 28.65² =
  29. 29.52² =
  30. 30.94² =
  31. 31.34² =
  32. 32.75² =
  33. 33.83² =
  34. 34.91² =
  35. 35.95² =
  36. 36.99² =
  37. 37.79² =
  38. 38.78² =
  39. 39.73² =
  40. 40.84² =

Answer key

  1. 2116
  2. 8464
  3. 4761
  4. 1764
  5. 1369
  6. 6561
  7. 4624
  8. 5929
  9. 2209
  10. 1444
  11. 1089
  12. 4356
  13. 5041
  14. 7921
  15. 961
  16. 2916
  17. 2304
  18. 9409
  19. 2025
  20. 1936
  21. 9216
  22. 1681
  23. 1521
  24. 2401
  25. 2601
  26. 7569
  27. 9604
  28. 4225
  29. 2704
  30. 8836
  31. 1156
  32. 5625
  33. 6889
  34. 8281
  35. 9025
  36. 9801
  37. 6241
  38. 6084
  39. 5329
  40. 7056

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