78000
Number of words = 256 * 33 * 9
Estimate = 260 * 30 * 10
= 78000
3/10; 0.305; 1/3; 35%
- Estimate approximately to the same denominator
- So , 0.333; 0.305; 0.35; 0.3
- This makes it easier to rank the numbers
1/20; 1/5; 1/4; 6/20; 3/2
- Use estimation if needed. So this would involve converting all of the fractions to the highest denominator which is 20
- 6/20; 4/20; 30/20; 1/20; 5/20
- This makes it easier to rank them
a) 24
Half of the 48 students so 24
b) 1/4
c) 4
Pizza is about 1/3 of 1/4.
1/4 = 12 children given 1/2 = 24
So 1/3 of 12 = 4
Approximately 40°
An acute angle
35
- Use the power of estimation. This is a crucial technique in maths
- As you are doing questions, try and estimate the answer.
- When you calculate your answer, you will have an idea if you are close to the answer
- In the above, round the numbers. So it becomes 7 * 5 (Given square root of 26 is approx 5)
- Answer will be 35
a) Approx 8cm. (Range 6 – 8cm is acceptable as it depends on the size of the online image or print out)
b) 35
8s into 280 . Use bus stop
c) £32.50
Firstly calculate number of weeks for 2 Years. This is 52 * 2 = 104
Next , number of “8 week batches” in 104 weeks. = 13
So cost is £2.50 x 13
d) 3,500
4 squeaks per minute. Therefore, 240 per hour
For 14 hours, its 240 * 14 = 3,360. Nearest 500 = 3,500