← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 776 · 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. 1.51² =
  2. 2.29² =
  3. 3.69² =
  4. 4.89² =
  5. 5.89² =
  6. 6.71² =
  7. 7.89² =
  8. 8.49² =
  9. 9.29² =
  10. 10.21² =
  11. 11.39² =
  12. 12.79² =
  13. 13.69² =
  14. 14.41² =
  15. 15.79² =
  16. 16.79² =
  17. 17.69² =
  18. 18.29² =
  19. 19.51² =
  20. 20.49² =
  21. 21.71² =
  22. 22.69² =
  23. 23.51² =
  24. 24.79² =
  25. 25.21² =
  26. 26.59² =
  27. 27.59² =
  28. 28.91² =
  29. 29.81² =
  30. 30.19² =
  31. 31.21² =
  32. 32.49² =
  33. 33.21² =
  34. 34.51² =
  35. 35.41² =
  36. 36.49² =
  37. 37.61² =
  38. 38.79² =
  39. 39.89² =
  40. 40.41² =

Answer key

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

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