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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 472 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.49² =
  2. 2.59² =
  3. 3.49² =
  4. 4.81² =
  5. 5.69² =
  6. 6.71² =
  7. 7.91² =
  8. 8.79² =
  9. 9.51² =
  10. 10.49² =
  11. 11.39² =
  12. 12.71² =
  13. 13.71² =
  14. 14.49² =
  15. 15.59² =
  16. 16.31² =
  17. 17.61² =
  18. 18.19² =
  19. 19.21² =
  20. 20.41² =
  21. 21.81² =
  22. 22.51² =
  23. 23.51² =
  24. 24.29² =
  25. 25.21² =
  26. 26.81² =
  27. 27.31² =
  28. 28.71² =
  29. 29.19² =
  30. 30.49² =
  31. 31.41² =
  32. 32.31² =
  33. 33.31² =
  34. 34.69² =
  35. 35.39² =
  36. 36.79² =
  37. 37.79² =
  38. 38.31² =
  39. 39.89² =
  40. 40.19² =

Answer key

  1. 2401
  2. 3481
  3. 2401
  4. 6561
  5. 4761
  6. 5041
  7. 8281
  8. 6241
  9. 2601
  10. 2401
  11. 1521
  12. 5041
  13. 5041
  14. 2401
  15. 3481
  16. 961
  17. 3721
  18. 361
  19. 441
  20. 1681
  21. 6561
  22. 2601
  23. 2601
  24. 841
  25. 441
  26. 6561
  27. 961
  28. 5041
  29. 361
  30. 2401
  31. 1681
  32. 961
  33. 961
  34. 4761
  35. 1521
  36. 6241
  37. 6241
  38. 961
  39. 7921
  40. 361

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