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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 49 · 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. 1.29² =
  2. 2.59² =
  3. 3.31² =
  4. 4.19² =
  5. 5.89² =
  6. 6.41² =
  7. 7.19² =
  8. 8.89² =
  9. 9.61² =
  10. 10.39² =
  11. 11.31² =
  12. 12.59² =
  13. 13.89² =
  14. 14.31² =
  15. 15.49² =
  16. 16.71² =
  17. 17.51² =
  18. 18.79² =
  19. 19.59² =
  20. 20.59² =
  21. 21.21² =
  22. 22.31² =
  23. 23.89² =
  24. 24.69² =
  25. 25.49² =
  26. 26.19² =
  27. 27.71² =
  28. 28.39² =
  29. 29.39² =
  30. 30.59² =
  31. 31.71² =
  32. 32.61² =
  33. 33.41² =
  34. 34.49² =
  35. 35.51² =
  36. 36.29² =
  37. 37.69² =
  38. 38.19² =
  39. 39.89² =
  40. 40.71² =

Answer key

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

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