1. 8.37 x 10
5. 0.0000078 x 1000
2. 4.6 x 10
6. 0.00805 x 100
3. 49.87 x 100
7. 0.0893 x 10000
4. 4.907 x 10
8. 357.126 x 10000
I. 1. 0.9 x 0.4
5. 0.8 x 0.09
2. 0.07 x 0.05
6. 2.63 x 0.0004
4. 0.006 x 0.009
3. 0.008 x 3
7. 150 x 0.007
8. 52.8 x 0.007
3. 0.678 x 860
4. 0.0095 x 81.7
II. 1. 5.9 x 2.3
2. 0.009 x 0.049
5. How many decimal places does (1.4) have ?
V. Multiple Choice Questions (MCQs)
1. If 213 x 16 = 3408, then 1.6 x 2.13 equals.
(a) 0.3408
(b) 34.08
(c) 3.408
(d) 340.8
2. One inch = 2.54 cm. How many centimeters are
there in 100 inches ?
(a) 0.0254
(b) 25.4
(c) 254
(d) 25400
V. High Order Thinking Skills (HOTS)
1. 3 x 0.3 x 0.03 < 0.003 x 3000 equals
(a) 0.00243
(b) 0.000243
(c) 243
(d) 0.243
2. 0.05 x 5 – 0.005 5 equals
(a) 2.250
(b) 0.225
(c) 0.0225
(d) 0.275
Answers
Examples 1
Add (4.5 x 10 4) + (1.75 x 10 4)
Explanation
The quantities have similar exponents, therefore by using distributive property of multiplication, the numbers are factored out;
(4.5 x 10 4) + (1.75 x 10 4) = (4.5 + 1.75) x 10 4
Add the coefficients and multiply by the power of 10
(4.5 + 1.75) x 10 4= 25 x 10 4
Therefore, (4.5 x 10 4) + (1.75 x 10 4) = 6.25 x 10 4
Example 2
Add (7.5 x 10 3) + (5.25 x 10 5)
Explanation
In this case, the powers of the quantities are different, we need to manipulate the power with a larger exponent.
Therefore, the property of exponents; b m x b n = b m + n is used to rewrite the exponent of 10 5 = 10 2 x 10 3
Now group the quantities: (7.5 x 10 3) + (5.25 x 10 5) = (7.5 x 10 3) + (5.25 x 10 2 x 103)
= (7.5 x 10 3) + [(5.25 x 10 2) x 103]
Answer:
answer given by above user.. hope that will help uh!