Distinguishing part-to-part and part-to-whole ratios
Read the labels: red : blue compares two parts, whereas red : total compares a part with the whole.
- Read the labels: red : blue compares two parts, whereas red : total compares a part with the whole.
- The whole contains both categories. Add their amounts to find it.
- A part-to-whole ratio is not the same as the part-to-part ratio.
Example 1
There are 6 red and 9 blue counters. Find red : blue and red : total.
Example 2
There are 12 red and 16 blue counters. Find red : blue and red : total.
Remember
Use the worked steps to check your method, not just the final answer.
Your turn
There are 20 red and 25 blue counters. Find red : blue and red : total.
Check answer
There are 30 red and 36 blue counters. Find red : blue and red : total.
Check answer
There are 42 red and 49 blue counters. Find red : blue and red : total.
Check answer
There are 21 red and 24 blue counters. Find red : blue and red : total.
Check answer
There are 32 red and 36 blue counters. Find red : blue and red : total.
Check answer
There are 20 red and 25 blue counters. Find red : blue and red : total.
AnswerThere are 30 red and 36 blue counters. Find red : blue and red : total.
AnswerThere are 42 red and 49 blue counters. Find red : blue and red : total.
AnswerThere are 21 red and 24 blue counters. Find red : blue and red : total.
AnswerThere are 32 red and 36 blue counters. Find red : blue and red : total.
Answer