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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 247 · 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. 1.81² =
  2. 2.21² =
  3. 3.59² =
  4. 4.61² =
  5. 5.19² =
  6. 6.61² =
  7. 7.21² =
  8. 8.69² =
  9. 9.89² =
  10. 10.49² =
  11. 11.19² =
  12. 12.21² =
  13. 13.51² =
  14. 14.61² =
  15. 15.31² =
  16. 16.79² =
  17. 17.89² =
  18. 18.69² =
  19. 19.49² =
  20. 20.71² =
  21. 21.19² =
  22. 22.81² =
  23. 23.91² =
  24. 24.41² =
  25. 25.69² =
  26. 26.69² =
  27. 27.59² =
  28. 28.81² =
  29. 29.19² =
  30. 30.39² =
  31. 31.31² =
  32. 32.39² =
  33. 33.39² =
  34. 34.29² =
  35. 35.61² =
  36. 36.29² =
  37. 37.41² =
  38. 38.31² =
  39. 39.31² =
  40. 40.21² =

Answer key

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

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