Make a problem for each of these forms: of 21 = 7. 217, 3 times. 6. How much must Harry pay for 3 rubber balls, if each costs 7 cents? One ball costs 7 cents; 3 balls will cost 3 times as much. Three times 7 cents are 21 cents. Slate work: 7 cents, cost of 1 ball. 3 (number of times 7-cents are used). 21 cents, cost of 3 balls. At $7 each, what will 3 rugs cost? (Make a picture for this problem.) How many 7-dollars must you pay for the rugs? Each make a problem for this form: 3 × 7 = 21. If there are 7 peas in a pod, how many peas in 3 such pods? (Picture.) 7. 21 cubes are how many three-cubes? 777 116 115 116 111 661 166 21 is how many 3's? 217 threes. 21÷ 3 = 7. 7 threes are how many? 7 threes 21. 7 x 3 =? = 3 is what part of 21? of 21 = ? ? Seven sevenths of 21 = ? How many 3's can you take out of 21? Begin with 21 and subtract 3's. Begin with 3 and add by 3's to 21, Some sparrows were in the maple tree; 7, which was of the number, flew down. How many were there in the tree at first? 8. Make a picture and give the written form for each of the following problems: A gardener takes 21 plants to market, and sells only one seventh of them; how many does he sell? Give 21 shells to 7 children; how many will each receive if their shares are equal? Anna gathered 3 wild roses from each of 7 branches of a rosebush; how many did she gather in all ? At 3 cents each, how many penholders can you get for 21 cents? Divide 21 pansies equally among mother, sister, and aunt; how many will each receive? Make problems for the following forms: Answer the questions you have asked, giving slate work in full. 9. Divide 22 balls into two equal groups. 22 balls are how many eleven-balls? = 11 balls are what part of 22 balls? 11 is what part of 22 of 22 = ? 2 times 11 balls are how many? 2 x 11 = ? 22 peaches are how many times 11 peaches 10. 22 balls are how many two-balls? 11 two-balls are how many ? 11 twos are how many? 11 x 2 = ? 22 equals how many 2's? 22 22 22 ÷ 2 = 11. = eleven 2's. 2 balls are what part of 22 balls? 2 is what part of 22 ? Divide 22 bananas equally among 11 children; how many will each receive? What part of the whole will each receive? 11. Make problems for: 3 oranges) 21 oranges 3) 21 oranges each receives etc. If I have 21 oranges and wish to give 3 oranges to each, 12. Divide 23 into twos. 00 00 00 00 00 00 00 00 00 00 00 0 23 equals how many 2's? (Eleven twos and the half of one two, or 11 twos.) 23 2 111. 111 x 2 = ? = At 2 cents a yard, how many yards of fancy paper can you buy for 23 cents, if you spend all the money? (As many yards as there are 2's in 23.) 13. Divide 23 apples equally between two boys. What part of the whole number will each receive? How many will each receive? Each receives of 23 apples, which is 113 apples. Divide 23 sheets of paper equally between 2 girls. What part of all the paper will each receive? How many sheets will each get? 11 twos less 11 ones = ? 23 contains 2 how many times? 23 contains 11 how many times? 14. 24 equals how many twelves? 24 ÷ 12 =? 2 twelves are how many? 2 × 12 = ? A dozen is what part of 24? Roy bought two dozen pieces of colored crayon, and used of them the first term of school. How many did he use? 15. 24 equals how many twos? 24 ÷ 2 =? 12 twos are how many? 12 x 2 = ? 2 is what part of 24? One twelfth of 24 cherries? One twelfth of 24 = ? cherries are how many Show with objects the difference between one twelve and one twelfth. 24 cherries are how many times 2 cherries? At 2 cents each, what will a dozen eggs cost? of 12 = ? of 1 = ? 16. 24 is how many 8's? 24 ÷ 8 = ? ? 3 eights are how many? 3×8 = 8 is what part of 24? of 24 ? Count 24 by 8's. Subtract by 8's. 24 nails are how many times eight nails? Give 24 nuts to 3 boys. How many will each receive, if the nuts are divided equally? (Picture.) |