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Number 1: a = 5

Step-by-step explanation:

Here cross multiplication is applicable, as such:

10 * 3 = 6 * a

30 = 6a

a = 5

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step-by-step explanation:

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870