Section H: Subtraction Just like addition, the first step is to make the
exponents the same. Instead of adding the main numbers, they are
subtracted. Try to convert so that you will not get a negative answer.
4
3
3
3
Model: (3 x 10
) - (2 x 10
) = (30 x 10
) - (2 x 10
)
3
= 28 x 10
(same exponent)
4
= 2.8 x 10
(final answer)
same exponent
final answer
2
1
37) (2 x 10
) - (4 x 10
) = ______________________
___________________
-6
-7
38) (3 x 10
) - (5 x 10
) = ______________________
______________________
12
9
39) (9 x 10
) - (8.1 x 10
) = ____________________
______________________
-4
2
40) (2.2 x 10
) - (3 x 10
) = _____________________
______________________