Rounding Whole Numbers and Decimals
Estimating Sums and Differences
Adding Decimals
Subtracting Decimals
Draw a Picture/Multi Step Problems
100
Round this number to the nearest hundred. 25,806
25,800
100
Estimate the difference. 19.7-6.9
13
100
13.88+7.694
21.574
100
82.7-5.59
77.11
100
Theater tickets for children cost $5. Adult tickets cost $3 more. If 2 adults and 2 children buy theater tickets, what is the total cost?
$26
200
Round this number to the nearest thousand. 322,698
323,000
200
Estimate the sum. 59+43+95
200
200
39.488 + 26.7
66.188
200
43.3 - 12.82
30.48
200
A mason needs 22 bricks to make a stoop. So far he has carried 15 to the site. How many more bricks must he carry? Draw a picture. Write an equation. Write a number sentence. Solve.
22 - 15 = x; 22 - 15 = 7; 7 bricks
300
Round this decimal to the nearest tenth. 2.44
2.4
300
Estimate the difference. 87.99-52.46
36
300
88.8 + 4.277 + 78.95
172.027
300
7.28 - 4.928
2.352
300
Mark is buying souvenirs at the zoo’s gift shop for 35 relatives. He has selected 19 souvenirs so far. How many more souvenirs does Mark need to select? Write an equation, and then solve.
35 - 19 = x, x = 16; Mark needs to select 16 more souvenirs.
400
Round this decimal to the nearest hundredth. 3.997
4.00
400
Brigid worked 16.75 h. Kevin worked 12.50 h. About how many more hours did Brigid work than Kevin?
About 4
400
Is 16.7 a reasonable sum for 7.5 + 9.2?
Yes; 7.5 rounds to 8.0; 9.2 rounds to 9.0; 8.0 + 9.0 = 17.0.
400
Find the missing numbers: 2._ _ -_.6 4 _______ 1.2 9
2.9 3 -1.6 4 _______ 1.2 9
400
Carly needs to buy 26 tickets for the monorail ride at the zoo. She bought 17 tickets so far. How many more tickets does Carly need to buy? Write an equation, and then solve.
26 - 17 = x, x = 9; Carly needs to buy 9 more tickets.
500
Round this number to the nearest thousandth. 0.5285
0.529
500
Estimate the total weight of two boxes that weigh 9.4 lb and 62.6 lb using rounding and compatible numbers. Which estimate is closer to the actual total weight?
Compatible numbers: 10 + 60 = 70 Rounding: 9 + 62 = 71 Actual: 72.0 The rounding estimate is closer.
500
Kendall the tiger recently got weighed. He weighed 306.78 pounds. His companion, Wilson, weighed 38.49 pounds more. How much did Wilson weigh in pounds?
345.27
500
Explain how to subtract 4.8 from 13.64
Write the numbers, lining up the decimal points. Write zeros to show place value. Subtract the hundredths, the tenths, and the ones. Place the decimal point in the answer.
500
Gerard has two $5 bills and three $10 bills. He spends $3.85 for a milkshake and $7.98 for a banana split. How much money does he have left?
$28.17