Question
Consider the numbers in the following boxes:
Image
Using these numbers and the operations addition and subtraction, we can write: $39,800=40,000-800+300+300$
Similarly, write the following numbers by using the numbers in the boxes:
$45,000 ; 5,900 ; 17,500 ; 21,400$

Answer

$45,000=40,000+7,000-1,500-1,500+800+800-300-300$
$5,900=7,000-800-300$
$17,500=12,000+7,000-1,500\quad\quad$ $21,400=12,000+7,000+800+800+800$

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