5 times 2 are 10 5 times 3 are 15 5 times 4 are 20 5 times 5 are 25 5 times 6 are 30 6 times 1 are 6 6 times 2 are 12 6 times 3 are 18 6 times 4 are 24 6 times 5 are 30 6 times 6 are 36 5 times 8 are 40 5 times 9 are 45 5 times 10 are 50 5 times 11 are 55 5 times 12 are 60 6 times 7 are 42 6 times 8 are 48 6 times 9 are 54 6 times 10 are 60 6 times 11 are 66 6 times 12 are 72 MENTAL EXERCISES. 1. If a man can cradle 3 acres of wheat in one day, how many acres can he cradle in 5 days. ANS. 15 acres. Why 15 acres? Because, if he can cradle 3 acres in 1 day, in 5 days he can cradle 5 times 3 acres; 5 times 3 acres are 15 acres. can cradle 15 acres. Therefore, in 5 days he 2. At 2 dollars a day, how much will a man earn in 5 days? Why? In 6 days? Why? 3. What will 5 barrels of flour cost, at 4 dollars a barrel ? What will 6 barrels cost? Why? 4. If a horse travel 6 miles in an hour, how far will he travel in 5 hours? In 6 hours? Why? 5. A farmer bought a plow for 5 dollars; what would 5 plows cost, at the same rate? What would 6 plows cost? Why? 6. There are 7 days in a week; how many days in 5 weeks? In 6 weeks? Why? 7. What will 5 yards of satinet cost, at 7 shillings a yard? What will 6 yards cost? Why? 8. At 8 cents apiece, how much will 5 melons come to? How much will 6 melons come to? Why? 9. How far will a boat sail in 5 hours, at the rate of 9 miles an hour? How far in 6 hours? Why? 10. When hay is worth 10 dollars a ton, what will 5 tons cost? What will 6 tons cost? Why? 11. How many yards are there in 5 pieces of cloth, there being 12 yards in each piece? How many yards in 6 pieces? Why? 12. How much will 5 pounds of honey cost, at 11 cents a pound? How much will 6 pounds cost? Why? 13. Which is the most, 6 times 6 or 4 times 9? MENTAL EXERCISES. 1. Milford bought 7 oranges, at 3 cents apiece; how many cents did they cost him? ANS. 21 cents. Why 21 cents? Because, if 1 orange cost 3 cents, 7 oranges will cost 7 times 3 cents; 7 times 3 cents are 21 cents. Therefore, the oranges cost him 21 cents. 2. If a market-woman receive 2 dollars a day for fruit, how many dollars will she receive in 7 days? Why? In 8 days? Why? 3. Elias paid 4 shillings for a knife; what would 7 knives cost, at the same rate? What would 8 knives cost? Why? 4. When Daniel uses 6 sheets of paper in a week, how many sheets will he use in 7 weeks? How many in 8 weeks? Why? 5. What will 7 hats cost, at 5 dollars apiece? What will 8 hats cost, at the same price? Why? 6. If a mill grind 7 bushels of wheat in one hour, how many bushels will it grind in 7 hours? How many in 8 hours? Why? 7. In one square yard there are 9 square feet; how many square feet are there in 7 square yards? In 8 square yards? Why? 8. If you write 8 lines each day, how many lines will you write in 7 days? In 8 days? Why? 9. When coffee is worth 10 cents a pound, how much must you pay for 7 pounds? How much for 8 pounds? Why? 10. At 12 dollars a month, how much will a man earn in 7 months? In 8 months? Why? 11. How many are 7 times 11? 7 times 12? |