Use 1% or 10% to estimate 8% of 310.

To estimate the 8% of 310, we use 10% method since 8 when rounded off is equals to 10.

The 10% of a number can simply be obtained by moving the decimal place one point to the left.

Therefore using the 10% method, the 8% of 310 is approximately 31.0

10% = 31.0

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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