How do I multiply decimal numbers?
Start by multiplying the two numbers as though they didn't have a decimal point (e.g. 2.73.6 becomes 2736 = 972). Now add up how many decimal places were in the original two numbers (e.g. 2.7 and 3.6 have 2 decimal places, 3.45 and 9.2 have 3 decimal places) and give your answer that number of decimal places (e.g. since 2.7 and 3.6 have 2 decimal places, 2.73.6 will have 2 decimal places. Calculate 2736 = 972, then give it 2 decimal places to get 2.7*3.6 = 9.72).
Remember that, in this situation, zeroes should be counted as decimal places. For example: 1.024.05. Calculate 102405 = 41,310. Now notice that 1.02 and 4.05 have 4 decimal places. Therefore, give 41,310 4 decimal places to find that 1.02*4.05 = 4.1310.
Step by step this is layed out as:
1) Multiply without decimal points.
2) Count the number of decimal places in the 2 numbers you're multiplying.
3) Give your answer to part (1) the number of decimal places from part (2).
Related Maths 11 Plus answers
All answers ▸There are 8 pink frogs in a pond, 25 blue frogs, 12 red frogs and 5 orange frogs. What percentage are pink?
The point p lies on the curve with eqn x = (4y - sin(2y)^2, given that p has coordinates (p,π/2), p is a constant, a) find the exact value of p; the tangent to the curve at P cuts the y-axis at A, b) use calculus to find the coordinates of A.
How do I do work out the area of a rectangle?
How many thirds are there in 8? a)3 b)24 c)9 d)22 e)4