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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 885 · 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. 1.84² =
  2. 2.31² =
  3. 3.89² =
  4. 4.86² =
  5. 5.73² =
  6. 6.72² =
  7. 7.91² =
  8. 8.59² =
  9. 9.38² =
  10. 10.51² =
  11. 11.37² =
  12. 12.61² =
  13. 13.94² =
  14. 14.78² =
  15. 15.67² =
  16. 16.33² =
  17. 17.42² =
  18. 18.46² =
  19. 19.56² =
  20. 20.52² =
  21. 21.74² =
  22. 22.32² =
  23. 23.98² =
  24. 24.35² =
  25. 25.83² =
  26. 26.55² =
  27. 27.82² =
  28. 28.48² =
  29. 29.57² =
  30. 30.71² =
  31. 31.44² =
  32. 32.95² =
  33. 33.68² =
  34. 34.64² =
  35. 35.66² =
  36. 36.39² =
  37. 37.58² =
  38. 38.47² =
  39. 39.41² =
  40. 40.81² =

Answer key

  1. 7056
  2. 961
  3. 7921
  4. 7396
  5. 5329
  6. 5184
  7. 8281
  8. 3481
  9. 1444
  10. 2601
  11. 1369
  12. 3721
  13. 8836
  14. 6084
  15. 4489
  16. 1089
  17. 1764
  18. 2116
  19. 3136
  20. 2704
  21. 5476
  22. 1024
  23. 9604
  24. 1225
  25. 6889
  26. 3025
  27. 6724
  28. 2304
  29. 3249
  30. 5041
  31. 1936
  32. 9025
  33. 4624
  34. 4096
  35. 4356
  36. 1521
  37. 3364
  38. 2209
  39. 1681
  40. 6561

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