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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 418 · 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. 1.79² =
  2. 2.29² =
  3. 3.71² =
  4. 4.19² =
  5. 5.51² =
  6. 6.79² =
  7. 7.21² =
  8. 8.19² =
  9. 9.91² =
  10. 10.69² =
  11. 11.69² =
  12. 12.89² =
  13. 13.91² =
  14. 14.59² =
  15. 15.39² =
  16. 16.19² =
  17. 17.89² =
  18. 18.31² =
  19. 19.49² =
  20. 20.21² =
  21. 21.51² =
  22. 22.91² =
  23. 23.49² =
  24. 24.79² =
  25. 25.39² =
  26. 26.69² =
  27. 27.19² =
  28. 28.39² =
  29. 29.21² =
  30. 30.91² =
  31. 31.51² =
  32. 32.79² =
  33. 33.49² =
  34. 34.29² =
  35. 35.79² =
  36. 36.19² =
  37. 37.91² =
  38. 38.51² =
  39. 39.41² =
  40. 40.89² =

Answer key

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

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