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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 457 · 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. 1.69² =
  2. 2.41² =
  3. 3.19² =
  4. 4.19² =
  5. 5.81² =
  6. 6.39² =
  7. 7.49² =
  8. 8.79² =
  9. 9.41² =
  10. 10.19² =
  11. 11.39² =
  12. 12.59² =
  13. 13.51² =
  14. 14.31² =
  15. 15.59² =
  16. 16.71² =
  17. 17.59² =
  18. 18.39² =
  19. 19.71² =
  20. 20.69² =
  21. 21.39² =
  22. 22.69² =
  23. 23.89² =
  24. 24.71² =
  25. 25.21² =
  26. 26.91² =
  27. 27.69² =
  28. 28.59² =
  29. 29.61² =
  30. 30.19² =
  31. 31.89² =
  32. 32.71² =
  33. 33.31² =
  34. 34.31² =
  35. 35.59² =
  36. 36.91² =
  37. 37.79² =
  38. 38.39² =
  39. 39.19² =
  40. 40.29² =

Answer key

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

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