← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 335 · 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. 2.71² =
  3. 3.69² =
  4. 4.91² =
  5. 5.61² =
  6. 6.29² =
  7. 7.89² =
  8. 8.21² =
  9. 9.71² =
  10. 10.19² =
  11. 11.71² =
  12. 12.41² =
  13. 13.49² =
  14. 14.21² =
  15. 15.91² =
  16. 16.71² =
  17. 17.71² =
  18. 18.39² =
  19. 19.29² =
  20. 20.51² =
  21. 21.21² =
  22. 22.19² =
  23. 23.21² =
  24. 24.69² =
  25. 25.29² =
  26. 26.89² =
  27. 27.39² =
  28. 28.61² =
  29. 29.31² =
  30. 30.69² =
  31. 31.29² =
  32. 32.51² =
  33. 33.61² =
  34. 34.71² =
  35. 35.69² =
  36. 36.49² =
  37. 37.69² =
  38. 38.29² =
  39. 39.59² =
  40. 40.59² =

Answer key

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

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