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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 656 · 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. 2.79² =
  3. 3.59² =
  4. 4.71² =
  5. 5.41² =
  6. 6.89² =
  7. 7.81² =
  8. 8.61² =
  9. 9.41² =
  10. 10.29² =
  11. 11.49² =
  12. 12.61² =
  13. 13.29² =
  14. 14.61² =
  15. 15.39² =
  16. 16.29² =
  17. 17.79² =
  18. 18.31² =
  19. 19.89² =
  20. 20.79² =
  21. 21.19² =
  22. 22.79² =
  23. 23.79² =
  24. 24.81² =
  25. 25.41² =
  26. 26.49² =
  27. 27.71² =
  28. 28.59² =
  29. 29.69² =
  30. 30.61² =
  31. 31.49² =
  32. 32.69² =
  33. 33.39² =
  34. 34.31² =
  35. 35.89² =
  36. 36.21² =
  37. 37.29² =
  38. 38.51² =
  39. 39.89² =
  40. 40.91² =

Answer key

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

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