Oh, what a happy little question! It looks like the number that goes into both 21 and 49 is 7. Just like painting a beautiful landscape, sometimes we need to find the common elements that bring everything together. Keep exploring and you'll uncover more hidden treasures along the way.
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The number 7. 7 goes into 21 3 times; 7 goes into 49 7 times.
The only common factor of 49 and 64 (whole number that goes into both of them evenly) is ' 1 '.
3 x 49 and 7 x 21
One.
It is: 1