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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 979 · 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. 1.83² =
  2. 2.44² =
  3. 3.95² =
  4. 4.89² =
  5. 5.59² =
  6. 6.64² =
  7. 7.51² =
  8. 8.99² =
  9. 9.48² =
  10. 10.34² =
  11. 11.72² =
  12. 12.61² =
  13. 13.96² =
  14. 14.52² =
  15. 15.38² =
  16. 16.36² =
  17. 17.65² =
  18. 18.98² =
  19. 19.39² =
  20. 20.82² =
  21. 21.75² =
  22. 22.71² =
  23. 23.41² =
  24. 24.37² =
  25. 25.49² =
  26. 26.57² =
  27. 27.32² =
  28. 28.88² =
  29. 29.91² =
  30. 30.55² =
  31. 31.47² =
  32. 32.63² =
  33. 33.79² =
  34. 34.66² =
  35. 35.84² =
  36. 36.93² =
  37. 37.69² =
  38. 38.35² =
  39. 39.31² =
  40. 40.76² =

Answer key

  1. 6889
  2. 1936
  3. 9025
  4. 7921
  5. 3481
  6. 4096
  7. 2601
  8. 9801
  9. 2304
  10. 1156
  11. 5184
  12. 3721
  13. 9216
  14. 2704
  15. 1444
  16. 1296
  17. 4225
  18. 9604
  19. 1521
  20. 6724
  21. 5625
  22. 5041
  23. 1681
  24. 1369
  25. 2401
  26. 3249
  27. 1024
  28. 7744
  29. 8281
  30. 3025
  31. 2209
  32. 3969
  33. 6241
  34. 4356
  35. 7056
  36. 8649
  37. 4761
  38. 1225
  39. 961
  40. 5776

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