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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 471 · 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. 1.32² =
  2. 2.86² =
  3. 3.89² =
  4. 4.51² =
  5. 5.61² =
  6. 6.87² =
  7. 7.33² =
  8. 8.82² =
  9. 9.56² =
  10. 10.43² =
  11. 11.69² =
  12. 12.44² =
  13. 13.47² =
  14. 14.63² =
  15. 15.72² =
  16. 16.92² =
  17. 17.64² =
  18. 18.84² =
  19. 19.73² =
  20. 20.58² =
  21. 21.75² =
  22. 22.94² =
  23. 23.34² =
  24. 24.48² =
  25. 25.37² =
  26. 26.88² =
  27. 27.99² =
  28. 28.46² =
  29. 29.65² =
  30. 30.71² =
  31. 31.52² =
  32. 32.66² =
  33. 33.38² =
  34. 34.57² =
  35. 35.54² =
  36. 36.97² =
  37. 37.31² =
  38. 38.98² =
  39. 39.55² =
  40. 40.42² =

Answer key

  1. 1024
  2. 7396
  3. 7921
  4. 2601
  5. 3721
  6. 7569
  7. 1089
  8. 6724
  9. 3136
  10. 1849
  11. 4761
  12. 1936
  13. 2209
  14. 3969
  15. 5184
  16. 8464
  17. 4096
  18. 7056
  19. 5329
  20. 3364
  21. 5625
  22. 8836
  23. 1156
  24. 2304
  25. 1369
  26. 7744
  27. 9801
  28. 2116
  29. 4225
  30. 5041
  31. 2704
  32. 4356
  33. 1444
  34. 3249
  35. 2916
  36. 9409
  37. 961
  38. 9604
  39. 3025
  40. 1764

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