2. Vocabulary standard form – a number is written using digits and place value (the regular way to write numbers). expanded form – a number is written as a sum using the place and value of each digit.
9. Number Lines Numbers towards the right on a number line are larger. As you move to the left on a number line, the numbers get smaller.
10. What’s Bigger? 1 or -2? 1 is larger because it is to the right of the -2. What numbers are smaller than -2? -3 and -4 are both smaller than -2 because they are to the left of -2.
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13. What’s Bigger? 456,789 or 456, 791? Line them up vertically: 456,789 456,791 Now, compare the numbers in the hundred thousands place. They are both 4. Next, we have 5’s. No difference. Then we have 6’s. Also, no difference. Now we are at the hundreds place, and we have a 7 in both numbers. When we get to the tens place, we finally have a difference. 9 is bigger than 8, so the second number is bigger.
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15. How do we write it? Or, you can use the < symbol. List the numbers in order from smallest to largest with the < symbol between them. 456 < 459 < 589 < 625 < 629 Separate your numbers with a semicolon (;) to avoid confusion. 456;459;589;625;629
