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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 698 · 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. 1.31² =
  2. 2.49² =
  3. 3.29² =
  4. 4.81² =
  5. 5.69² =
  6. 6.41² =
  7. 7.39² =
  8. 8.79² =
  9. 9.39² =
  10. 10.49² =
  11. 11.71² =
  12. 12.89² =
  13. 13.51² =
  14. 14.79² =
  15. 15.69² =
  16. 16.51² =
  17. 17.21² =
  18. 18.41² =
  19. 19.79² =
  20. 20.71² =
  21. 21.51² =
  22. 22.71² =
  23. 23.89² =
  24. 24.79² =
  25. 25.91² =
  26. 26.49² =
  27. 27.91² =
  28. 28.79² =
  29. 29.29² =
  30. 30.39² =
  31. 31.59² =
  32. 32.39² =
  33. 33.91² =
  34. 34.61² =
  35. 35.79² =
  36. 36.69² =
  37. 37.19² =
  38. 38.69² =
  39. 39.29² =
  40. 40.19² =

Answer key

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

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