Chapter 1.1 Whole Number Operations

Chapter 1.1Whole Number Operations Joseph Williams Melvin E. Sine Elementary Jwilliams@gesd40.org McDougal Littell Middle School Math Course 1 Objective: Add, subtract, multiply,and divide whole numbers.

Vocabulary Whole Number – p. 684 – the numbers 1,2,3,….. Sum – p. 689 – the result when two or more numbers are added. Difference – p. 689 – the result when one number is subtracted from another number.

Vocabulary Product – p. 690 – the result when two or more numbers are multiplied. Quotient – p. 691 – the result of a division. Divisor – p. 691 – the number by which another number is divided Dividend – p. 691 – a number that is divided by another number Remainder – p. 691 – if a divisor does not divide a dividend evenly, the remainder is the whole number left over after the division

Adding Whole Numbers 1. Line up the numbers in the ones place. 2. Add the ones. 3. Add the tens. 49 + 36 1.) 2.) 3.) 1 1 49+3685 49+36 5 49+36

Adding Whole Numbers You have 92 baseball cards. Your brother gives you 37 baseball cards. How many cards do you have? 92+37 Did you get 129?

Subtracting Whole Numbers 1. Line up the numbers in the ones place. 2. Subtract the ones. 3. Subtract the tens (and so on) 76 - 39 1.) 2.) 3.) 6 6 16 16 You need more ones to subtract 9, so regroup. 76- 39 76- 397 76- 3937

Subtracting Whole Numbers The scores on your first two math tests were 78 and 91. By how much did your score improve? 91- 78 Did you get 13?

Multiplying Whole Numbers Your guitar lessons cost $25 per week. How much will you pay for 12 weeks of lessons? You need to find the product of 25 x 12. First, multiply 25 by the ones’ digit 2. 25x 12 Then, multiply 25 by the tens’ digit 1. 50 25 Add the partial products. 300

Multiplying Whole Numbers You have 12 boxes of apples. Each box has 14 apples in it. How many apples do you have? 12x 14 Did you get 168?

Chapter 1.1 Whole Number Operations