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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 508 · 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. 1.29² =
  2. 2.79² =
  3. 3.61² =
  4. 4.19² =
  5. 5.29² =
  6. 6.81² =
  7. 7.29² =
  8. 8.51² =
  9. 9.91² =
  10. 10.41² =
  11. 11.49² =
  12. 12.21² =
  13. 13.59² =
  14. 14.29² =
  15. 15.79² =
  16. 16.89² =
  17. 17.89² =
  18. 18.71² =
  19. 19.39² =
  20. 20.29² =
  21. 21.79² =
  22. 22.59² =
  23. 23.19² =
  24. 24.69² =
  25. 25.49² =
  26. 26.41² =
  27. 27.69² =
  28. 28.89² =
  29. 29.49² =
  30. 30.61² =
  31. 31.39² =
  32. 32.59² =
  33. 33.79² =
  34. 34.31² =
  35. 35.39² =
  36. 36.21² =
  37. 37.59² =
  38. 38.79² =
  39. 39.39² =
  40. 40.39² =

Answer key

  1. 841
  2. 6241
  3. 3721
  4. 361
  5. 841
  6. 6561
  7. 841
  8. 2601
  9. 8281
  10. 1681
  11. 2401
  12. 441
  13. 3481
  14. 841
  15. 6241
  16. 7921
  17. 7921
  18. 5041
  19. 1521
  20. 841
  21. 6241
  22. 3481
  23. 361
  24. 4761
  25. 2401
  26. 1681
  27. 4761
  28. 7921
  29. 2401
  30. 3721
  31. 1521
  32. 3481
  33. 6241
  34. 961
  35. 1521
  36. 441
  37. 3481
  38. 6241
  39. 1521
  40. 1521

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