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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 763 · 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. 2.41² =
  3. 3.91² =
  4. 4.19² =
  5. 5.51² =
  6. 6.31² =
  7. 7.71² =
  8. 8.91² =
  9. 9.61² =
  10. 10.39² =
  11. 11.49² =
  12. 12.61² =
  13. 13.39² =
  14. 14.81² =
  15. 15.29² =
  16. 16.61² =
  17. 17.91² =
  18. 18.19² =
  19. 19.51² =
  20. 20.39² =
  21. 21.49² =
  22. 22.19² =
  23. 23.79² =
  24. 24.29² =
  25. 25.21² =
  26. 26.89² =
  27. 27.91² =
  28. 28.89² =
  29. 29.49² =
  30. 30.91² =
  31. 31.61² =
  32. 32.29² =
  33. 33.79² =
  34. 34.31² =
  35. 35.71² =
  36. 36.39² =
  37. 37.51² =
  38. 38.41² =
  39. 39.69² =
  40. 40.79² =

Answer key

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

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