ADDING TWO COLUMNS AT ONCE Sight Find the sum, adding both columns at once: Beginning with 1; 2; 3: 4; 5; 6; 7; 8; 9; 10; 11; 12; 20; 21, add the numbers in examples 1 to 12. Why are units written under units, tens under tens, etc., in adding numbers? NOTE. Pupils should be required to prove work in fundamental processes until accuracy becomes a habit. 1. Find the total area of these possessions of the United States: Alaska, 590,844 square miles; Guam, 210 square miles; Hawaii, 6499 square miles; Panama Canal Zone, 474 square miles; Philippine Islands, 115,026 square miles; Porto Rico, 3435 square miles; and the Tutuila Group, 77 square miles. 2. In one month Mr. Blanchard paid $17.50 for rent, $14.87 for groceries, $12.68 for provisions, $2.94 for milk, $1.50 for ice, $3.75 for shoes, $7.55 for clothing, and $3.29 for other expenses. What was the total? TABLE OF ELECTRIC RAILWAYS IN THE UNITED STATES IN 1908 3. Find the total number of companies; miles of track used; cars operated. 4. There are in the United States 148 streams with a navigable length of 5305 miles flowing into the Atlantic, 54 with a navigable length of 7641 miles flowing into the Gulf, 53 with a navigable length of 11,483 miles flowing into the Mississippi, 2 with a navigable length of 315 miles flowing into Canadian waters, and 38 with a navigable length of 1606 miles flowing into the Pacific. Find the total number of navigable streams. The total number of miles navigable. 10 13 16 19 Subtraction is the process of taking one num ber from another, or of finding the difference between two numbers. What is the sign of subtraction? What is it called? What does it show? What is the minuend? What is the subtrahend? 14 What is the result of subtraction? 17 12 18 15 11 How is work in subtraction tested? Subtract 2 from each number in the diagram. Subtract 3; 4; 5; 6; 7; 8; 9. From the numbers in the drill table on page 5, take 2; 4; 6; 8; 1; 3; 5; 7; 9. From 100 take each number in the drill table. Give the difference between 48 and the numbers in the drill table. Between other numbers and the numbers in the drill table. |