Adding Decimals
Subtracting Decimals
Multiplying and Dividing by 10, 100, 1000
Multiplying and Dividing by an exponent
Estimate
100
Solve using the standard algorithm. 0.3+ 0.82=
1.12
100
Solve using the standard algorithm. 1.8-0.9=
0.9
100
Use the place value chart and arrows to show how the value of each digit changes. 3.452 X 10 =
34.52
100
Please write the number in standard form. 4.025 × 10^3 = ____________
4,025
100
Choose the reasonable product for each expression. Explain your reasoning in the spaces below using words, pictures, or numbers. 2.5 X 4= 0.1 1 10 100
10 Twenty- five tenths X 4 is 100 tenths. 100 tenths is 10.
200
Solve using the standard algorithm. 57.03+2.08=
59.11
200
Solve using the standard algorithm. 50.416-4.25=
46.166
200
Use the place value chart and arrows to show how the value of each digit changes. 3.452 X 1,000 =
3,452
200
Please write the number in standard form. 39 X 10^4=
390,000
200
Choose the reasonable product for each expression. Explain your reasoning in the spaces below using words, pictures, or numbers. 3.14 X 7 = 2198 219.8 21.98 2.198
21.98 I know the product has to be 3.7 plus some more. The answer has to be 21 and something.
300
Solve using the standard algorithm. 85.703+12.197=
97.9
300
Solve using the standard algorithm. 741-3.91=
737.09
300
455÷1,000=
0.455
300
Please write in standard form. 72.5 ÷ 10^2=
0.725
300
Choose the reasonable product for each expression. Explain your reasoning in the spaces below using words, pictures, or numbers. 8 X 6.022= 4.8176 48.176 481.76 4817.6
48.176 8 X 6= 48 8 X 0.022 is rounded to 8 X 0.02. 8 X 2 hundredths is 16 hundredths. 48+ .16 is close to 48.176.
400
Solve using the standard algorithm. 62.573+4.328=
66.901
400
Solve by using the standard algorithm. 341.84-21.92=
319.92
400
Solve. 36,000÷10=
3,600
400
Please write in standard form. 7,200,000 ÷ 10^3=
7,200
400
Choose the reasonable product for each expression. Explain your reasoning in the spaces below using words, pictures, or numbers. 9 X 5.48 = 493.2 49.32 4.932 0.4932
9 X 5= 45 I rounded .48 to .5 9 X .5 = 4.5 45+ 4.5 is 49.5 49.5 is close to 49.32
500
Van Cortlandt Park’s walking trail is 1.02 km longer than Marine Park. Central Park’s walking trail is 0.242 km longer than Van Cortlandt’s. Please fill in the missing information in the chart below. New York City Walking Trails: Central Park ________ km Marine Park 1.28 km Van Cortlandt Park ________ km
Central Park 2.542 km Van Cortlandt Park 2.30km
500
Solve. 6 ones 7 hundredths-2.3
6.07-2.3= 3.77
500
Canada has a population that is about 1/10 as large as the United States. If Canada’s population is about 32 million, about how many people live in the United States? Explain the number of zeros in your answer.
1 unit=32 millions 10 units=10 X 32 millions =320 millions =320,000,000 About 320 millions of people live in the U.S. Since 1 million has 6 zeros, 320 millions will also have 6 additional zeros at the end.
500
Please write in standard form. 9 X 10 ^3=
9,000
500
The poetry club had its first bake sale, and they made $79.35. The club members are planning to have 4 more bake sales. Leslie said, “If we make the same amount at each bake sale, we’ll earn $3,967.50.” Peggy said, “No way, Leslie! We’ll earn $396.75 after five bake sales.” Use estimation to help Peggy explain why Leslie’s reasoning is inaccurate. Show your reasoning using words, numbers, or pictures.
$79.35 can be estimated to $80.00. $80.00 X 5= $400.00. Leslie did not estimate correctly.
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