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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 104 · 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. 1.71² =
  2. 2.71² =
  3. 3.79² =
  4. 4.79² =
  5. 5.91² =
  6. 6.81² =
  7. 7.59² =
  8. 8.91² =
  9. 9.51² =
  10. 10.59² =
  11. 11.89² =
  12. 12.69² =
  13. 13.69² =
  14. 14.91² =
  15. 15.59² =
  16. 16.71² =
  17. 17.79² =
  18. 18.59² =
  19. 19.81² =
  20. 20.81² =
  21. 21.21² =
  22. 22.61² =
  23. 23.31² =
  24. 24.71² =
  25. 25.21² =
  26. 26.59² =
  27. 27.39² =
  28. 28.49² =
  29. 29.31² =
  30. 30.91² =
  31. 31.89² =
  32. 32.79² =
  33. 33.39² =
  34. 34.91² =
  35. 35.39² =
  36. 36.91² =
  37. 37.19² =
  38. 38.19² =
  39. 39.79² =
  40. 40.19² =

Answer key

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

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