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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 635 · 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. 1.39² =
  2. 2.89² =
  3. 3.79² =
  4. 4.39² =
  5. 5.51² =
  6. 6.59² =
  7. 7.49² =
  8. 8.89² =
  9. 9.79² =
  10. 10.49² =
  11. 11.91² =
  12. 12.61² =
  13. 13.61² =
  14. 14.89² =
  15. 15.71² =
  16. 16.81² =
  17. 17.39² =
  18. 18.59² =
  19. 19.69² =
  20. 20.59² =
  21. 21.59² =
  22. 22.31² =
  23. 23.59² =
  24. 24.89² =
  25. 25.59² =
  26. 26.41² =
  27. 27.31² =
  28. 28.31² =
  29. 29.39² =
  30. 30.91² =
  31. 31.19² =
  32. 32.91² =
  33. 33.39² =
  34. 34.71² =
  35. 35.71² =
  36. 36.49² =
  37. 37.61² =
  38. 38.81² =
  39. 39.81² =
  40. 40.89² =

Answer key

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

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