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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 413 · 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. 1.39² =
  2. 2.71² =
  3. 3.39² =
  4. 4.31² =
  5. 5.19² =
  6. 6.59² =
  7. 7.91² =
  8. 8.29² =
  9. 9.39² =
  10. 10.39² =
  11. 11.79² =
  12. 12.49² =
  13. 13.49² =
  14. 14.39² =
  15. 15.89² =
  16. 16.29² =
  17. 17.91² =
  18. 18.69² =
  19. 19.49² =
  20. 20.61² =
  21. 21.21² =
  22. 22.51² =
  23. 23.61² =
  24. 24.61² =
  25. 25.21² =
  26. 26.61² =
  27. 27.49² =
  28. 28.31² =
  29. 29.71² =
  30. 30.79² =
  31. 31.39² =
  32. 32.79² =
  33. 33.69² =
  34. 34.41² =
  35. 35.19² =
  36. 36.61² =
  37. 37.89² =
  38. 38.61² =
  39. 39.69² =
  40. 40.69² =

Answer key

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

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