CIE Mathematics Paper-1: Specimen Questions 54 - 56 of 175

Question number: 54

Short Answer Question▾

Write in Short

When x=9 find the value of x3+4x25x

Explanation

Here, x3+4x25x, where x=9.

So, 93+4×925×9=729+32445=1008.

Question number: 55

Short Answer Question▾

Write in Short

Find value of (325)1 as a fraction.

Explanation

Here, (325)1=(175)1=(517)1=517.

Question number: 56

Short Answer Question▾

Write in Short

343÷57

(a) (i) Write both numbers in the calculation above correct to one significant figure.

(ii) Use your answer above to estimate the value of the calculation.

(b) Find the value of the calculation correct to two significant figures.

Explanation

Here,

(a) (i) Number 343 correct to one significant figure will be: 300 , where 3 is significant figure while both 0s are at left side of decimal point which are not significant.

Number 57 correct to one significant figure will be: 60 because in the number after 5 there is 7 which is greater than 5 so 5 will be increased by 1 and be 6 which is significant figure while 0 is at left side of decimal point which is not significant.

So, 300÷60

(ii) Answer of 300÷60 will be 5 which is estimate value of 300÷60.

(b) Calculation of 343÷57 will be: 6.017.

Now, 6.017 correct it to two significant figures: 6.0 where 6 and 0 are significant.

Share