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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 7 · 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. 1.49² =
  2. 2.19² =
  3. 3.81² =
  4. 4.89² =
  5. 5.21² =
  6. 6.21² =
  7. 7.61² =
  8. 8.91² =
  9. 9.61² =
  10. 10.79² =
  11. 11.51² =
  12. 12.69² =
  13. 13.69² =
  14. 14.21² =
  15. 15.79² =
  16. 16.51² =
  17. 17.21² =
  18. 18.49² =
  19. 19.59² =
  20. 20.29² =
  21. 21.49² =
  22. 22.39² =
  23. 23.69² =
  24. 24.19² =
  25. 25.19² =
  26. 26.81² =
  27. 27.39² =
  28. 28.29² =
  29. 29.21² =
  30. 30.59² =
  31. 31.31² =
  32. 32.19² =
  33. 33.81² =
  34. 34.71² =
  35. 35.89² =
  36. 36.31² =
  37. 37.59² =
  38. 38.89² =
  39. 39.81² =
  40. 40.61² =

Answer key

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

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