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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 358 · 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. 1.34² =
  2. 2.44² =
  3. 3.81² =
  4. 4.54² =
  5. 5.48² =
  6. 6.35² =
  7. 7.39² =
  8. 8.33² =
  9. 9.71² =
  10. 10.41² =
  11. 11.31² =
  12. 12.49² =
  13. 13.91² =
  14. 14.98² =
  15. 15.62² =
  16. 16.52² =
  17. 17.61² =
  18. 18.96² =
  19. 19.65² =
  20. 20.58² =
  21. 21.45² =
  22. 22.97² =
  23. 23.99² =
  24. 24.72² =
  25. 25.57² =
  26. 26.75² =
  27. 27.76² =
  28. 28.47² =
  29. 29.53² =
  30. 30.66² =
  31. 31.78² =
  32. 32.56² =
  33. 33.64² =
  34. 34.51² =
  35. 35.38² =
  36. 36.74² =
  37. 37.95² =
  38. 38.32² =
  39. 39.94² =
  40. 40.79² =

Answer key

  1. 1156
  2. 1936
  3. 6561
  4. 2916
  5. 2304
  6. 1225
  7. 1521
  8. 1089
  9. 5041
  10. 1681
  11. 961
  12. 2401
  13. 8281
  14. 9604
  15. 3844
  16. 2704
  17. 3721
  18. 9216
  19. 4225
  20. 3364
  21. 2025
  22. 9409
  23. 9801
  24. 5184
  25. 3249
  26. 5625
  27. 5776
  28. 2209
  29. 2809
  30. 4356
  31. 6084
  32. 3136
  33. 4096
  34. 2601
  35. 1444
  36. 5476
  37. 9025
  38. 1024
  39. 8836
  40. 6241

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