Here are four digits. 8 5 3 7
a) Use three of these digits to write down the smallest possible 3-digit number.
(1)
b) Here are four different digits.
6
1
9
4.
Put one of these digits in each box to give the largest possible answer
to the subtraction. You must use each digit only once.
(1)

A: 357

(1) 9641

Step-by-step explanation:

With A you really just want to go from the smallest number up so it would be the smallest number possible.

EX. 357 vs. 736   357 is smaller

With 1 you have to go from the highest number to lowest number to get the biggest answer possible.

Ex.  9641 vs. 1946    9641 is larger.

step-by-step explanation:

left be aligning the decimal points is required to not required see the number of digits to the right