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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 164 · 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. 1.39² =
  2. 2.79² =
  3. 3.61² =
  4. 4.71² =
  5. 5.91² =
  6. 6.21² =
  7. 7.31² =
  8. 8.91² =
  9. 9.79² =
  10. 10.89² =
  11. 11.41² =
  12. 12.49² =
  13. 13.29² =
  14. 14.91² =
  15. 15.79² =
  16. 16.19² =
  17. 17.61² =
  18. 18.31² =
  19. 19.81² =
  20. 20.91² =
  21. 21.19² =
  22. 22.89² =
  23. 23.61² =
  24. 24.39² =
  25. 25.89² =
  26. 26.51² =
  27. 27.59² =
  28. 28.59² =
  29. 29.89² =
  30. 30.39² =
  31. 31.39² =
  32. 32.29² =
  33. 33.79² =
  34. 34.59² =
  35. 35.39² =
  36. 36.51² =
  37. 37.31² =
  38. 38.29² =
  39. 39.51² =
  40. 40.31² =

Answer key

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

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