WRITTEN EXERCISES

1. Iowa contains 56,025 square miles; Illinois, 56,650 square miles; South Dakota, 77,650 square miles. What is the combined area of these states?

2. A certain post office received 4500 letters on Monday; 3250 on Tuesday; 3770 on Wednesday; 2200 on Thursday. How many letters were received in the four days?

3. A farmer sells five loads of hay. The first weighs 2420 lb.; the second, 2100 lb.; the third, 1962 lb.; the fourth, 1860 lb.; the fifth, 2040 lb. What do the five loads weigh together?

When a quantity is expressed in two or more measures it is called a denominate number; thus: 5 gal. 2 qt. 1 pt. is a denominate number.

ADDITION OF DENOMINATE NUMBERS

Add 24 qt. 1 pt. and 7 qt. 1 pt.

24 qt. 1 pt.

7 qt. 1 pt. 32 qt.

Write pints under pints and quarts under quarts. 1 pt. and 1 pt. are 2 pt. or 1 qt. Add the 1 qt. to the sum of the quarts. The whole sum is 32 qt.

Add 7 wk. 4 da. and 11 wk. 6 da.

7 wk. 4 da.

11 wk. 6 da.

19 wk. 3 da.

Write days under days and weeks under weeks. 6 da. and 4 da. are 10 da., or 1 wk. and 3 da. Write the 3 da. Add the 1 wk. to the sum of the weeks. The whole sum

Add 9 bu. 3 pk. and 5 bu. 2 pk.

Write pecks under pecks and bushels under bushels.

9 bu. 3 pk.

5 bu. 2 pk.

15 bu. 1 pk.

3 pk. and 2 pk. are 5 pk., or 1 bu. and 1 pk. Write the 1 pk., and add the 1 bu. to the sum of the bushels. The whole sum is 15 bu. 1 pk.

Add 10 hr. 42 min. and 8 hr. 37 min.

Write minutes under minutes and hours under hours. 42 min. and 37 min. are 79 min., or 1 hr. 19 min. Write the 19 min. and add the 1 hr. to the sum of the hours. The whole sum is 19 hr. 19 min.

10 hr. 42 min. 8 hr. 37 min. 19 hr. 19 min.

In ordinary business 30 days is usually considered as a month.

3

Add 3

yr.

4 mo. 15 da. and 5 yr. 9 mo. 17 da.

15 da. and 17 da. are 32 da., or 1 mo. 2 da. Write the 2 da. and add the 1 mo. to the sum of the months. 13 mo. and 1 mo. are 14 mo., or 1 yr. 2 mo. Write the 2 mo. and add the 1 yr. to the sum of The whole sum is 9 yr. 2 mo. 2 da.

yr. 4 mo. 15 da. 9 mo. 17 da. 2 mo. 2 da.

5 yr.

9

yr.

the

years.

SUBTRACTION

ORAL EXERCISES

1. Count backward from 100 by 6's; 7's; 8's; 9's. 2. Give the remainders at sight:

4. Mabel spent 85 cents for Christmas and Lucy spent 42 cents. How much more did Mabel spend than Lucy? 5. Grandfather is 83 years old and father is 49 years old. How much older than father is grandfather?