Adding Numbers in
Scientific Notation
Find the Sum.

4
4.2 × 10
4
+ (6.5 × 10 )
Answer
1.07
5
× 10
Find the Sum

5
6.5 × 10
+ ( 3.9 × 10 )
6
Answer
6
4.55 × 10
Find the Sum.

5
7.3 × 10
2
+ (3.2 × 10 )
Answer (note – exponent
should be 5 not 3)
3
(7.3032 × 10
)
Find the sum

3.51 × 105 + (8.132 × 105 )
Answer
(1.1642
× 10 )
6
Find the Sum

6
5.67 × 10
4
+ (3.46 × 10 )
Answer
6
(5.7046 × 10
)
Find the sum.

6.82 × 103 + (2.345 × 105 )
Answer
(2.4132 ×
5
10 )
Find the Sum

1.132 × 107 + (2.23 × 104 )
Answer
7
(1.13423 × 10
)
Find the difference

4
7.34 × 10
− (2.3 × 10 )
4
Answer
4
(5.04 × 10
)
Find the Difference

4.245 × 107 − (1.35 × 107 )
Answer
7
(2.895 × 10
)