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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 854 · 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. 1.19² =
  2. 2.81² =
  3. 3.49² =
  4. 4.69² =
  5. 5.91² =
  6. 6.31² =
  7. 7.61² =
  8. 8.61² =
  9. 9.79² =
  10. 10.29² =
  11. 11.19² =
  12. 12.41² =
  13. 13.49² =
  14. 14.19² =
  15. 15.61² =
  16. 16.89² =
  17. 17.51² =
  18. 18.51² =
  19. 19.49² =
  20. 20.69² =
  21. 21.39² =
  22. 22.19² =
  23. 23.81² =
  24. 24.29² =
  25. 25.21² =
  26. 26.81² =
  27. 27.49² =
  28. 28.89² =
  29. 29.89² =
  30. 30.71² =
  31. 31.69² =
  32. 32.19² =
  33. 33.21² =
  34. 34.41² =
  35. 35.41² =
  36. 36.39² =
  37. 37.51² =
  38. 38.21² =
  39. 39.69² =
  40. 40.19² =

Answer key

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

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