Answer:
a) 127m (3 s.f.)
b) 271m (3 s.f.)
Step-by-step explanation:
Please see the attached pictures for full solution.
Method 1 is written in black and method 2 is written in pink.
We start with 12/20. Half both numbers = 6/10. Half again = 3/5.
Because 3/5 are both odd numbers and can't be made smaller without using decimals (which you don't want to use within a fraction), 3/5 is the simplest form for this fraction.
If you take away the 0s you can multiply 8 and 3. sooooo
3x8=24
It's 40=8+11+21 it adds the previous answer<span />