Oral Review and Practice in Whole Numbers 1. If a five-cent loaf weighs 12 ounces, how much should a 10-cent loaf weigh? 2. Eric received 20 cents for 3 hours' work. At that rate what should he receive for 12 hours' work? 3. The sum of two numbers is 28. One of the numbers is 16. What is the other? 4. 20 is how much more than 11? 5. Clara used 6 cups of flour in making 70 cookies. How many cups of flour should she use for 35 cookies? 6. Three eggs are used in making 50 doughnuts. dozen eggs would be enough for how many doughnuts? One 7. Albert feeds his horse 32 quarts of grain in three days. At the same rate, how many quarts does he feed the horse in 30 days? (30 is how many times 3?) 8. What is the cost of 50 five-cent stamps? 9. 25×10=? 37×100=? 16×200= ? 108×400 = ? 10. 96 is the product of 8 and what other number? Written 1. Willis has 15 hens. eggs apiece in one year. of them? They laid at the rate of 120 How many eggs were laid by all 2. The food for the hens cost $21. Willis sold the eggs at an average price of 22 cents a dozen. How much more did he receive for the eggs than he paid for the food for the hens? 3. What was the profit from one hen? 4. What would be the profit from 75 hens at the same rate? 5. Willis has a rectangular hen park 30 ft. long and 15 How many feet of wire netting will inclose it? ft. wide. Problems of Carrying the Mail 1. A rural mail carrier works 298 days in a year and rides 24 miles each day. How far does he ride in a year? 2. He starts at 8.15 A.M. and returns home at 3.15 P.M. every day. How many hours does he spend on the road in a year? He handled mail during one month as follows: 3. The total number of pieces delivered was how much and it costs him $16 a month to keep his horse, how much of the salary is left to pay him for his year's work? FACTORS AND MULTIPLES 1. 2 × 3 = ? 2 x 5 = ? 2 X3 X5 = ? 2. What must be done with 2 and 3 to obtain 6? 3. With 2 and 5 to obtain 10? 4. With 2, 3, and 5 to obtain 30? The numbers that are multiplied to produce a number are factors of that number; e.g. 2, 3, and 5 are factors of 30 because 2 × 3 × 5 = 30. 5. What are the factors of 6? Of 4? Of 10? A number that exactly contains another number is a multiple of that number; e.g. 21 is a multiple of 7. It is also a multiple of 3. A product is always a multiple of its factors. 7. Tell which of the following numbers are multiples, and which are factors: 8. Every number is a multiple of itself. What is the smallest number that is a multiple of 2? 9. What is the smallest multiple of 2 and 3? Of 3 and 4? Of 2, 3, and 4? 10. Name all of the numbers that are exactly contained in 4; in 6; in 8; in 10; in 9. 1. How many inch spaces are there on this rule? 3. How many quarter-inches make one half-inch? 4. How many eighth-inches make one quarter-inch? One half-inch? 1. Look at the line MN and tell b. How many sixths there are in . c. To what we may change halves and thirds before we = 1. 87-621 ? 2. 59-381? 3. 995-831=? 4. 43% +21=? 5. 281 +15% = ? 6. 15+37 = ? yd. 7. Esther has three dolls. In making clothes for them she used yd. of muslin, yd. of gingham, and of cotton poplin. How much material did she use in all? 8. Vincent bought 2 boxes of screws and gave Wilfred 1 boxes for his shop. How many boxes of screws did Vincent keep? 9. Elton works for Mr. Stone by the hour while out of school. In one week he worked as follows: Monday 1 hr., Tuesday 24 hr., Wednesday 2 hr., Thursday hr., Friday 1 hr., Saturday 6 hr. How many hours did he work during the week? |