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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 743 · 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. 2.59² =
  3. 3.91² =
  4. 4.19² =
  5. 5.69² =
  6. 6.59² =
  7. 7.61² =
  8. 8.51² =
  9. 9.21² =
  10. 10.59² =
  11. 11.39² =
  12. 12.31² =
  13. 13.59² =
  14. 14.49² =
  15. 15.61² =
  16. 16.31² =
  17. 17.59² =
  18. 18.41² =
  19. 19.49² =
  20. 20.39² =
  21. 21.41² =
  22. 22.49² =
  23. 23.29² =
  24. 24.71² =
  25. 25.69² =
  26. 26.69² =
  27. 27.29² =
  28. 28.61² =
  29. 29.59² =
  30. 30.61² =
  31. 31.51² =
  32. 32.39² =
  33. 33.49² =
  34. 34.59² =
  35. 35.79² =
  36. 36.89² =
  37. 37.69² =
  38. 38.49² =
  39. 39.59² =
  40. 40.21² =

Answer key

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

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