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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 349 · 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. 3.79² =
  4. 4.19² =
  5. 5.71² =
  6. 6.71² =
  7. 7.79² =
  8. 8.81² =
  9. 9.79² =
  10. 10.61² =
  11. 11.91² =
  12. 12.29² =
  13. 13.69² =
  14. 14.31² =
  15. 15.71² =
  16. 16.29² =
  17. 17.31² =
  18. 18.81² =
  19. 19.29² =
  20. 20.19² =
  21. 21.91² =
  22. 22.79² =
  23. 23.49² =
  24. 24.81² =
  25. 25.49² =
  26. 26.61² =
  27. 27.39² =
  28. 28.49² =
  29. 29.79² =
  30. 30.79² =
  31. 31.71² =
  32. 32.81² =
  33. 33.29² =
  34. 34.91² =
  35. 35.89² =
  36. 36.79² =
  37. 37.19² =
  38. 38.51² =
  39. 39.31² =
  40. 40.19² =

Answer key

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

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