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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 291 · 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. 1.79² =
  2. 2.88² =
  3. 3.65² =
  4. 4.93² =
  5. 5.69² =
  6. 6.58² =
  7. 7.86² =
  8. 8.81² =
  9. 9.67² =
  10. 10.62² =
  11. 11.51² =
  12. 12.52² =
  13. 13.38² =
  14. 14.98² =
  15. 15.89² =
  16. 16.63² =
  17. 17.66² =
  18. 18.57² =
  19. 19.96² =
  20. 20.36² =
  21. 21.61² =
  22. 22.97² =
  23. 23.92² =
  24. 24.48² =
  25. 25.91² =
  26. 26.33² =
  27. 27.55² =
  28. 28.95² =
  29. 29.32² =
  30. 30.41² =
  31. 31.56² =
  32. 32.73² =
  33. 33.64² =
  34. 34.75² =
  35. 35.31² =
  36. 36.37² =
  37. 37.42² =
  38. 38.39² =
  39. 39.84² =
  40. 40.71² =

Answer key

  1. 6241
  2. 7744
  3. 4225
  4. 8649
  5. 4761
  6. 3364
  7. 7396
  8. 6561
  9. 4489
  10. 3844
  11. 2601
  12. 2704
  13. 1444
  14. 9604
  15. 7921
  16. 3969
  17. 4356
  18. 3249
  19. 9216
  20. 1296
  21. 3721
  22. 9409
  23. 8464
  24. 2304
  25. 8281
  26. 1089
  27. 3025
  28. 9025
  29. 1024
  30. 1681
  31. 3136
  32. 5329
  33. 4096
  34. 5625
  35. 961
  36. 1369
  37. 1764
  38. 1521
  39. 7056
  40. 5041

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