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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 864 · 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. 1.89² =
  2. 2.59² =
  3. 3.39² =
  4. 4.79² =
  5. 5.79² =
  6. 6.51² =
  7. 7.81² =
  8. 8.39² =
  9. 9.71² =
  10. 10.61² =
  11. 11.29² =
  12. 12.89² =
  13. 13.71² =
  14. 14.79² =
  15. 15.79² =
  16. 16.61² =
  17. 17.81² =
  18. 18.91² =
  19. 19.49² =
  20. 20.29² =
  21. 21.39² =
  22. 22.21² =
  23. 23.89² =
  24. 24.89² =
  25. 25.29² =
  26. 26.39² =
  27. 27.29² =
  28. 28.21² =
  29. 29.19² =
  30. 30.61² =
  31. 31.71² =
  32. 32.81² =
  33. 33.71² =
  34. 34.71² =
  35. 35.39² =
  36. 36.39² =
  37. 37.19² =
  38. 38.31² =
  39. 39.79² =
  40. 40.19² =

Answer key

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

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