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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 152 · 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. 1.81² =
  2. 2.38² =
  3. 3.67² =
  4. 4.95² =
  5. 5.96² =
  6. 6.53² =
  7. 7.36² =
  8. 8.89² =
  9. 9.98² =
  10. 10.41² =
  11. 11.32² =
  12. 12.51² =
  13. 13.91² =
  14. 14.65² =
  15. 15.93² =
  16. 16.33² =
  17. 17.75² =
  18. 18.68² =
  19. 19.64² =
  20. 20.94² =
  21. 21.71² =
  22. 22.39² =
  23. 23.48² =
  24. 24.73² =
  25. 25.58² =
  26. 26.62² =
  27. 27.78² =
  28. 28.72² =
  29. 29.61² =
  30. 30.46² =
  31. 31.57² =
  32. 32.31² =
  33. 33.87² =
  34. 34.77² =
  35. 35.37² =
  36. 36.66² =
  37. 37.79² =
  38. 38.42² =
  39. 39.69² =
  40. 40.47² =

Answer key

  1. 6561
  2. 1444
  3. 4489
  4. 9025
  5. 9216
  6. 2809
  7. 1296
  8. 7921
  9. 9604
  10. 1681
  11. 1024
  12. 2601
  13. 8281
  14. 4225
  15. 8649
  16. 1089
  17. 5625
  18. 4624
  19. 4096
  20. 8836
  21. 5041
  22. 1521
  23. 2304
  24. 5329
  25. 3364
  26. 3844
  27. 6084
  28. 5184
  29. 3721
  30. 2116
  31. 3249
  32. 961
  33. 7569
  34. 5929
  35. 1369
  36. 4356
  37. 6241
  38. 1764
  39. 4761
  40. 2209

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