SaiBook.us Measurement

Lesson Example Discussion Quiz: Class Homework

Example

Title: Number line

Grade: 2-a Lesson: S1-L7

Explanation: The best way to understand measurement is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

The image shows the positive and negative numbers on a number line.

$1a$

Step 1a

Draw a number line with the number 0 in the middle and arrows extending to the left and right.
Label the number line with the numbers 597 and 623, placing 597 to the left of 623.
Starting at 623, move to the left on the number line by the amount of 597.
Count the number of spaces you moved to the left. This will give you the difference between 623 and 597. When you move 597 spaces to the left on the number line starting at 623, you will land on the number 26. This means that 623 minus 597 equals 26.

Explanation: Here, we are using the number lines for the given numbers. The greater number will be marked first on a number line. Then the other number will be moved toward the left in the number line.

Step 1b

Alternatively, you can perform the subtraction by breaking down the numbers into their place values and subtracting each place value separately.

Starting with the one’s place, 3 minus 7 is - 4, which means you need to borrow 1 from the tens place, making it 12.

Then you can subtract the tens place, 12 minus *9 is 3. Finally, subtract the hundreds place, 5 minus 6 is -1.

Combining the results from each place value gives you the answer of - 26, which means that 597 is 26 less than 623

Explanation: Here, we subtract one digit 3-7=13-7=6 borrowed from tens digit tens digit 2-9=11-9=2 2 becomes 1 and 1 borrowed from hundred digit hundred digit 6-5=5-5=0 6 becomes 5 Finally, we get -26.

Using the number line as a guide , to complete the given sentence. The number that is 11 more then the 562

$2a$

Step 2a

Draw a number line with the number 0 in the middle and arrows extending to the left and right.
Label the number line with the numbers 562 and 573, placing 562 to the left of 573.
Starting at 562, move to the right on the number line by the amount of 11.
Count the number of spaces you moved to the right. This will give you the number that is 11 more than 562. When you move 11 spaces to the right on the number line starting at 562, you will land on the number 573. This means that the number that is 11 more than 562 is 573.

Explanation: Here, we are using the number line for the given numbers. The first number will be marked on a number line. Then the other number will be moved toward the right in the number line.

Step 2b

Alternatively, you can perform the addition by adding 11 to 562 directly.

11plus2 from the one’s place equals 3 in the one’s place, and there is a carry-over of 1 to the tens place.

1 plus 6 (from the tens place) plus 1 (from the carry-over) equals 8 in the tens place.

The hundreds place remains the same, so the answer is 573.

Explanation: Here, we are using the number lines which is 11 more than 562. Then we get 573.