For problems 1-35, find the sums and differences.

### Exercise 1

#### Solution

937

### Exercise 2

### Exercise 3

#### Solution

565

### Exercise 4

### Exercise 5

#### Solution

559

### Exercise 6

### Exercise 7

#### Solution

1,342

### Exercise 8

### Exercise 9

#### Solution

2,001

### Exercise 10

### Exercise 11

#### Solution

1,963

### Exercise 12

### Exercise 13

#### Solution

79,456

### Exercise 14

### Exercise 15

#### Solution

96,953

### Exercise 16

### Exercise 17

#### Solution

791,824

### Exercise 18

### Exercise 19

#### Solution

8,301

### Exercise 20

### Exercise 21

#### Solution

140,381

### Exercise 22

### Exercise 23

#### Solution

76,224

### Exercise 24

### Exercise 25

#### Solution

4,955

### Exercise 26

### Exercise 27

#### Solution

185,611

### Exercise 28

### Exercise 29

#### Solution

2,238

### Exercise 30

### Exercise 31

#### Solution

1,338

### Exercise 32

### Exercise 33

#### Solution

878

### Exercise 34

### Exercise 35

#### Solution

618,227

For problems 36-39, add the numbers.

### Exercise 36

### Exercise 37

#### Solution

1,621

### Exercise 38

### Exercise 39

#### Solution

484,601

For problems 40-50, combine the numbers as indicated.

### Exercise 40

### Exercise 41

#### Solution

19,853

### Exercise 42

### Exercise 43

#### Solution

1,702

### Exercise 44

### Exercise 45

#### Solution

1,114

### Exercise 46

### Exercise 47

#### Solution

1,300

### Exercise 48

### Exercise 49

#### Solution

2,718

### Exercise 50

For problems 51-63, add and subtract as indicated.

### Exercise 51

Subtract 671 from 8,027.

#### Solution

7,356

### Exercise 52

Subtract 387 from 6,342.

### Exercise 53

Subtract 2,926 from 6,341.

#### Solution

3,415

### Exercise 54

Subtract 4,355 from the sum of 74 and 7,319.

### Exercise 55

Subtract 325 from the sum of 7,188 and 4,964.

#### Solution

11,827

### Exercise 56

Subtract 496 from the difference of 60,321 and 99.

### Exercise 57

Subtract 20,663 from the difference of 523,150 and 95,225.

#### Solution

407,262

### Exercise 58

Add the difference of 843 and 139 to the difference of 4,450 and 839.

### Exercise 59

Add the difference of 997,468 and 292,513 to the difference of 22,140 and 8,617.

#### Solution

718,478

### Exercise 60

Subtract the difference of 8,412 and 576 from the sum of 22,140 and 8,617.

### Exercise 61

Add the sum of 2,273, 3,304, 847, and 16 to the difference of 4,365 and 864.

#### Solution

9,941

### Exercise 62

Add the sum of 19,161, 201, 166,127, and 44 to the difference of the sums of 161, 2,455, and 85, and 21, 26, 48, and 187.

### Exercise 63

Is the sum of 626 and 1,242 the same as the sum of 1,242 and 626? Justify your claim.