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Sagot :
Answer
The idea behind Sue's answer is that she rounded the numbers given to the nearest whole number.
In rounding off numbers, when the number after the required level of precision is less than 5, we round it down. But if that number is 5 or more, we round it up.
So, in rounding 1.25 to the nearest whole number, the number after the required precision level is 2, so, since 2 is less than 5, we round this down and we are left with 1.
Then in rounding -2.69 to the nearest whole number, the number after the required precision level is 6, so, since 6 is more than 5, we round this up and we are left with -3.
So,
1.25 + (-2.69)
= 1 + (-3)
So, although Sue's answer is B, the correct answer is option A.
To pick option B, Sue must have just rounded the two numbers down.
2) Option B is correct.
1 1/5 = 1.2
3 2/3 = 3.6667
Rounding these to the nearest whole number,
1 1/5 = 1.2 = 1
3 2/3 = 3.67 = 4
1 1/5 × 3 2/3 = 1 × 4
3) We are told to pick the option that's closest to -7
Options C and D are actually the closest to -7
- A submarine goes 3.8 ft below the surface of the ocean and then goes 2.5 ft further down.
Since the elevation below sea level is given in the negative, the 3.8 ft and 2.5 ft further down would be -3.8 + (-2.5) = -6.3 ft
- The amount of money Sarah has after she buys milk for $3.85 and bread for $2.45
The amount of money Sarah has will be less the amount she has spent on milk and bread.
-3.85 + (-2.45) = -$6.3
Although, option C seems like the most correct because we can't really tell the exact amount that Sarah has to be honest. But we are sure the submarine has moved to a new elevation of -6.3 feet which is closest to -7.
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