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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 702 · 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. 2.49² =
  3. 3.29² =
  4. 4.79² =
  5. 5.39² =
  6. 6.61² =
  7. 7.21² =
  8. 8.61² =
  9. 9.51² =
  10. 10.41² =
  11. 11.29² =
  12. 12.69² =
  13. 13.41² =
  14. 14.89² =
  15. 15.89² =
  16. 16.21² =
  17. 17.71² =
  18. 18.49² =
  19. 19.91² =
  20. 20.21² =
  21. 21.89² =
  22. 22.41² =
  23. 23.39² =
  24. 24.79² =
  25. 25.59² =
  26. 26.59² =
  27. 27.49² =
  28. 28.91² =
  29. 29.31² =
  30. 30.49² =
  31. 31.49² =
  32. 32.41² =
  33. 33.41² =
  34. 34.79² =
  35. 35.89² =
  36. 36.51² =
  37. 37.91² =
  38. 38.31² =
  39. 39.19² =
  40. 40.19² =

Answer key

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

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