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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 636 · 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. 1.31² =
  2. 2.39² =
  3. 3.29² =
  4. 4.91² =
  5. 5.81² =
  6. 6.19² =
  7. 7.29² =
  8. 8.81² =
  9. 9.39² =
  10. 10.31² =
  11. 11.39² =
  12. 12.79² =
  13. 13.89² =
  14. 14.19² =
  15. 15.69² =
  16. 16.41² =
  17. 17.71² =
  18. 18.19² =
  19. 19.71² =
  20. 20.81² =
  21. 21.19² =
  22. 22.91² =
  23. 23.39² =
  24. 24.91² =
  25. 25.81² =
  26. 26.19² =
  27. 27.39² =
  28. 28.31² =
  29. 29.21² =
  30. 30.91² =
  31. 31.29² =
  32. 32.31² =
  33. 33.49² =
  34. 34.71² =
  35. 35.79² =
  36. 36.51² =
  37. 37.49² =
  38. 38.39² =
  39. 39.49² =
  40. 40.59² =

Answer key

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

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