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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 348 · 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. 2.29² =
  3. 3.81² =
  4. 4.49² =
  5. 5.89² =
  6. 6.71² =
  7. 7.59² =
  8. 8.31² =
  9. 9.61² =
  10. 10.21² =
  11. 11.49² =
  12. 12.49² =
  13. 13.91² =
  14. 14.61² =
  15. 15.69² =
  16. 16.71² =
  17. 17.91² =
  18. 18.71² =
  19. 19.91² =
  20. 20.31² =
  21. 21.31² =
  22. 22.51² =
  23. 23.51² =
  24. 24.61² =
  25. 25.89² =
  26. 26.19² =
  27. 27.39² =
  28. 28.89² =
  29. 29.79² =
  30. 30.49² =
  31. 31.19² =
  32. 32.19² =
  33. 33.39² =
  34. 34.29² =
  35. 35.61² =
  36. 36.59² =
  37. 37.61² =
  38. 38.71² =
  39. 39.71² =
  40. 40.71² =

Answer key

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

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