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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 168 · 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. 1.88² =
  2. 2.78² =
  3. 3.72² =
  4. 4.38² =
  5. 5.89² =
  6. 6.97² =
  7. 7.35² =
  8. 8.81² =
  9. 9.31² =
  10. 10.86² =
  11. 11.69² =
  12. 12.76² =
  13. 13.79² =
  14. 14.74² =
  15. 15.55² =
  16. 16.77² =
  17. 17.37² =
  18. 18.87² =
  19. 19.47² =
  20. 20.45² =
  21. 21.46² =
  22. 22.59² =
  23. 23.32² =
  24. 24.99² =
  25. 25.71² =
  26. 26.34² =
  27. 27.91² =
  28. 28.49² =
  29. 29.94² =
  30. 30.62² =
  31. 31.51² =
  32. 32.68² =
  33. 33.58² =
  34. 34.73² =
  35. 35.64² =
  36. 36.67² =
  37. 37.52² =
  38. 38.56² =
  39. 39.43² =
  40. 40.63² =

Answer key

  1. 7744
  2. 6084
  3. 5184
  4. 1444
  5. 7921
  6. 9409
  7. 1225
  8. 6561
  9. 961
  10. 7396
  11. 4761
  12. 5776
  13. 6241
  14. 5476
  15. 3025
  16. 5929
  17. 1369
  18. 7569
  19. 2209
  20. 2025
  21. 2116
  22. 3481
  23. 1024
  24. 9801
  25. 5041
  26. 1156
  27. 8281
  28. 2401
  29. 8836
  30. 3844
  31. 2601
  32. 4624
  33. 3364
  34. 5329
  35. 4096
  36. 4489
  37. 2704
  38. 3136
  39. 1849
  40. 3969

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