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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 331 · 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. 1.51² =
  2. 2.96² =
  3. 3.66² =
  4. 4.46² =
  5. 5.54² =
  6. 6.52² =
  7. 7.95² =
  8. 8.97² =
  9. 9.69² =
  10. 10.39² =
  11. 11.31² =
  12. 12.33² =
  13. 13.71² =
  14. 14.61² =
  15. 15.57² =
  16. 16.76² =
  17. 17.88² =
  18. 18.56² =
  19. 19.91² =
  20. 20.49² =
  21. 21.55² =
  22. 22.36² =
  23. 23.34² =
  24. 24.92² =
  25. 25.45² =
  26. 26.41² =
  27. 27.48² =
  28. 28.86² =
  29. 29.35² =
  30. 30.72² =
  31. 31.75² =
  32. 32.65² =
  33. 33.87² =
  34. 34.44² =
  35. 35.78² =
  36. 36.62² =
  37. 37.32² =
  38. 38.81² =
  39. 39.82² =
  40. 40.47² =

Answer key

  1. 2601
  2. 9216
  3. 4356
  4. 2116
  5. 2916
  6. 2704
  7. 9025
  8. 9409
  9. 4761
  10. 1521
  11. 961
  12. 1089
  13. 5041
  14. 3721
  15. 3249
  16. 5776
  17. 7744
  18. 3136
  19. 8281
  20. 2401
  21. 3025
  22. 1296
  23. 1156
  24. 8464
  25. 2025
  26. 1681
  27. 2304
  28. 7396
  29. 1225
  30. 5184
  31. 5625
  32. 4225
  33. 7569
  34. 1936
  35. 6084
  36. 3844
  37. 1024
  38. 6561
  39. 6724
  40. 2209

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