29. Write the results of each of the following in scientific notation. a. (8·1012)(6•1015) b. (16•1012) + (4•105) c. (5•10*)(6·10°) ÷ (15•1015) 30. Multiply each number below by 0.01 using mental computation. a. 2586 b. 34.79 d. 0.0037 c. 0.24 31. Iris worked a 40-hour week at $8.25/hr. Mentally compu did it. her salary for the week and explain how you did it 32. Mentally compute the number to fill in the blank in each of the following equations. a. 8.4·6 = 4.2 • b. 10.2 ÷ 0.3 = 20.4 ÷ c. ab = (a/2) • d. a ÷ b = (2a) ÷ 33. Round each of the following numbers as specified. a. 203.651 to the nearest hundred %3D b. 203.651 to the nearest ten c. 203.651 to the nearest unit d. 203.651 to the nearest tenth e. 203.651 to the nearest hundredth 34. Estimate the placement of each of the following values on the given number line by placing the letter for each com- putation in the appropriate box. a. 0.3 ÷ 0.31 b. 0.3 0.31
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
The directions read, compute the number to fill in the blank in each of the following equations.
C. ab = (a/2) • _____
D. a divide b = (2a) divide ______
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