Review Questions Please record the answers on your

1 -3 Comparing & Ordering Decimals Math 6 Mrs. Ymas

Target Goal: ü Compare decimals using models ü Use place value Word Power: ü

Using Models to Compare Decimals �Draw models for 0. 4 and 0. 36. Which

Using Decimal Models �Draw models for 0. 27 and 0. 7.

Draw models for the following � 0. 09 and 0. 9 � 0. 5

Decimals on the Number Line �Number Line – an infinite line that shows the

7) 0. 49; 0. 34; 0. 3; 0. 38 0. 3; 0. 34; 0.

17) 9. 2; 9. 02; 9. 209; 9. 024 9. 02; 9. 024; 9.

Order the decimals: � 2. 1; 2. 34; 2. 41; 2. 3; 2. 12

Brain Break � Try writing on air: 8 in your hands and 0 in

1 -4 Estimating with Decimals Word Power: q Compatible numbers q Front-end estimation q

Round UP or DOWN? ? ? �When do we round down? �When do we

Using Front-End Estimation � Step 1: Add the front digits � Step 2: Look

Exact or Estimate? ? ? � � � Record of attendance at a football

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Review Questions Please record the answers on your paper. 1. Write each number in standard form and in words. a) 500 + 50 + 2 2. Use > or < to compare. 662 ___ 68 3. Write in order from the least to the greatest. a) 57, 908; 54, 232; 6, 908; 540, 839; 77, 922 4. What is the value of 7 in 657, 098? 5. Write this in words and in expanded form: 69. 098

1 -3 Comparing & Ordering Decimals Math 6 Mrs. Ymas

Target Goal: ü Compare decimals using models ü Use place value Word Power: ü Number Line

Using Models to Compare Decimals �Draw models for 0. 4 and 0. 36. Which is greater? �A greater area is shaded for 0. 4 so 0. 4 > 0. 36.

Using Decimal Models �Draw models for 0. 27 and 0. 7.

Draw models for the following � 0. 09 and 0. 9 � 0. 5 and 0. 43 :

Decimals on the Number Line �Number Line – an infinite line that shows the place/order of numbers.

1) 0. 4 and 0. 5

3) 0. 2 and 0. 02 0. 2

5) 2. 1; 2. 53; 2. 5 2. 1; 2. 3; 2. 53

7) 0. 49; 0. 34; 0. 3; 0. 38 0. 3; 0. 34; 0. 38; 0. 49; 0. 4

9) 1. 42___ 1. 42 > 1. 4

11) 0. 3___0. 27 0. 3 > 0. 27

13) 0. 048___0. 408 0. 048 > 0. 408

15) 17. 1; 17. 7; 13. 7; 17. 1; 17. 7

17) 9. 2; 9. 02; 9. 209; 9. 024 9. 02; 9. 024; 9. 209

Order the decimals: � 2. 1; 2. 34; 2. 41; 2. 3; 2. 12 � 41. 90; 41. 89; 41. 09; 41. 78; 41. 88

Brain Break � Try writing on air: 8 in your hands and 0 in your feet.

1 -4 Estimating with Decimals Word Power: q Compatible numbers q Front-end estimation q Approximation (Approximately) q Estimate

Round UP or DOWN? ? ? �When do we round down? �When do we round up?

Estimate by ROUNDING (whole numbers)… �

Estimating with Compatible Numbers �

Using Front-End Estimation � Step 1: Add the front digits � Step 2: Look at the decimals and adjust the estimate STEP 1 5. 98 0. 81 + 9. 02 3. 45 4. 39 21 STEP 2 5. 98 à About 1 0. 81 à About 1 + 9. 02 About 1 3. 45 4. 39

Exact or Estimate? ? ? � � � Record of attendance at a football game. Amount of money you plan on spending when shopping. Amount of money a store cashier earns each hour. The time it takes to get to school Describe two situations, one that needs only an estimate and one that needs an exact answer. Explain why.

Homework: Practice 1. 3 and 1. 4 �