The table below shows the number of barrels of oil produced per day by some countries - OCR - GCSE Maths - Question 17 - 2020 - Paper 1

To find the difference in oil production between China and the UK, we first convert both numbers to ordinary form:

• China: $3.98 imes 10^6 = 3,980,000$
• UK: $9.39 imes 10^5 = 939,000$

Now, calculate the difference: $3,980,000 - 939,000 = 3,041,000$

To express this in standard form, we write: $3.041 imes 10^6$

Rounding to three significant figures gives us 3.04 × 10^6.

First, convert the production amounts for the USA and Japan into ordinary numbers:

• USA: $1.17 imes 10^7 = 11,700,000$
• Japan: $3.92 imes 10^3 = 3,920$

Now, check if the USA's production is approximately three times that of Japan: $3 imes 3,920 = 11,760$

Now compare it to the USA's production:

• USA: 11,700,000
• 3 times Japan: 11,760

Since 11,700,000 is significantly greater than 11,760, we can conclude that:

Jamal is incorrect because the USA produced much more than three times that of Japan.