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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 563 · 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. 1.19² =
  2. 2.31² =
  3. 3.59² =
  4. 4.81² =
  5. 5.19² =
  6. 6.91² =
  7. 7.19² =
  8. 8.21² =
  9. 9.71² =
  10. 10.19² =
  11. 11.91² =
  12. 12.61² =
  13. 13.51² =
  14. 14.79² =
  15. 15.19² =
  16. 16.41² =
  17. 17.89² =
  18. 18.31² =
  19. 19.69² =
  20. 20.29² =
  21. 21.31² =
  22. 22.31² =
  23. 23.31² =
  24. 24.39² =
  25. 25.19² =
  26. 26.91² =
  27. 27.61² =
  28. 28.21² =
  29. 29.31² =
  30. 30.61² =
  31. 31.79² =
  32. 32.91² =
  33. 33.49² =
  34. 34.61² =
  35. 35.39² =
  36. 36.31² =
  37. 37.29² =
  38. 38.21² =
  39. 39.31² =
  40. 40.89² =

Answer key

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

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