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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 244 · 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. 1.49² =
  2. 2.36² =
  3. 3.35² =
  4. 4.33² =
  5. 5.48² =
  6. 6.45² =
  7. 7.68² =
  8. 8.61² =
  9. 9.47² =
  10. 10.79² =
  11. 11.72² =
  12. 12.89² =
  13. 13.44² =
  14. 14.95² =
  15. 15.82² =
  16. 16.91² =
  17. 17.38² =
  18. 18.84² =
  19. 19.51² =
  20. 20.71² =
  21. 21.64² =
  22. 22.54² =
  23. 23.65² =
  24. 24.77² =
  25. 25.81² =
  26. 26.69² =
  27. 27.99² =
  28. 28.87² =
  29. 29.88² =
  30. 30.55² =
  31. 31.96² =
  32. 32.43² =
  33. 33.67² =
  34. 34.62² =
  35. 35.56² =
  36. 36.97² =
  37. 37.31² =
  38. 38.66² =
  39. 39.83² =
  40. 40.86² =

Answer key

  1. 2401
  2. 1296
  3. 1225
  4. 1089
  5. 2304
  6. 2025
  7. 4624
  8. 3721
  9. 2209
  10. 6241
  11. 5184
  12. 7921
  13. 1936
  14. 9025
  15. 6724
  16. 8281
  17. 1444
  18. 7056
  19. 2601
  20. 5041
  21. 4096
  22. 2916
  23. 4225
  24. 5929
  25. 6561
  26. 4761
  27. 9801
  28. 7569
  29. 7744
  30. 3025
  31. 9216
  32. 1849
  33. 4489
  34. 3844
  35. 3136
  36. 9409
  37. 961
  38. 4356
  39. 6889
  40. 7396

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