← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 10 · 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. 2.91² =
  3. 3.91² =
  4. 4.71² =
  5. 5.31² =
  6. 6.71² =
  7. 7.39² =
  8. 8.51² =
  9. 9.39² =
  10. 10.21² =
  11. 11.69² =
  12. 12.61² =
  13. 13.91² =
  14. 14.21² =
  15. 15.19² =
  16. 16.89² =
  17. 17.59² =
  18. 18.41² =
  19. 19.19² =
  20. 20.21² =
  21. 21.49² =
  22. 22.59² =
  23. 23.19² =
  24. 24.21² =
  25. 25.59² =
  26. 26.91² =
  27. 27.39² =
  28. 28.69² =
  29. 29.69² =
  30. 30.39² =
  31. 31.81² =
  32. 32.29² =
  33. 33.71² =
  34. 34.31² =
  35. 35.31² =
  36. 36.89² =
  37. 37.69² =
  38. 38.31² =
  39. 39.69² =
  40. 40.21² =

Answer key

  1. 6241
  2. 8281
  3. 8281
  4. 5041
  5. 961
  6. 5041
  7. 1521
  8. 2601
  9. 1521
  10. 441
  11. 4761
  12. 3721
  13. 8281
  14. 441
  15. 361
  16. 7921
  17. 3481
  18. 1681
  19. 361
  20. 441
  21. 2401
  22. 3481
  23. 361
  24. 441
  25. 3481
  26. 8281
  27. 1521
  28. 4761
  29. 4761
  30. 1521
  31. 6561
  32. 841
  33. 5041
  34. 961
  35. 961
  36. 7921
  37. 4761
  38. 961
  39. 4761
  40. 441

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths