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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 340 · 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. 1.91² =
  2. 2.69² =
  3. 3.51² =
  4. 4.49² =
  5. 5.89² =
  6. 6.39² =
  7. 7.39² =
  8. 8.39² =
  9. 9.81² =
  10. 10.71² =
  11. 11.71² =
  12. 12.21² =
  13. 13.91² =
  14. 14.19² =
  15. 15.89² =
  16. 16.29² =
  17. 17.71² =
  18. 18.39² =
  19. 19.31² =
  20. 20.81² =
  21. 21.91² =
  22. 22.69² =
  23. 23.71² =
  24. 24.51² =
  25. 25.61² =
  26. 26.39² =
  27. 27.79² =
  28. 28.89² =
  29. 29.21² =
  30. 30.31² =
  31. 31.31² =
  32. 32.89² =
  33. 33.39² =
  34. 34.49² =
  35. 35.89² =
  36. 36.51² =
  37. 37.51² =
  38. 38.69² =
  39. 39.91² =
  40. 40.21² =

Answer key

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

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