Unit 4: Estimating, Time, and Shapes
Unit 4 Review: Estimating, Time, and Shapes
You will now practice all the skills you learned in Unit 4. Check your work using the answer key at the end of the review.
- Estimate the following answers. Be sure to round to the nearest 10 before adding.
- [latex]\begin{align}23\\+32\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}68\\+17\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}34\\+28\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}42\\+53\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}74\\+24\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}33\\+28\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}17\\+42\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}27\\+18\\ \hline \\ \end{align}[/latex]
- Estimate the following sums. Be sure to round to the nearest 10 before adding.
- [latex]\begin{align}625\\+254\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}432\\+325\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}328\\+163\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}529\\+248\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}536\\+137\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}867\\+215\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}843\\+107\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}435\\+127\\ \hline \\ \end{align}[/latex]
- Estimate the following answers. Be sure to round to the nearest 10 before subtracting.
- [latex]\begin{align}43\\-28\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}64\\-25\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}73\\-47\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}83\\-24\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}68\\-28\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}54\\-22\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}67\\-29\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}85\\-29\\ \hline \\ \end{align}[/latex]
- Estimate the following answers. Be sure to round to the nearest 10 before subtracting.
- [latex]\begin{align}625\\-407\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}908\\-413\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}976\\-134\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}882\\-257\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}572\\-154\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}908\\-713\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}965\\-702\\ \hline \\ \end{align}[/latex]
- [latex]\begin{align}988\\-254\\ \hline \\ \end{align}[/latex]
- Write the following times in standard format.
- 10 hours, 20 minutes, 12 seconds
- 8 hours,45 minutes, 6 seconds
- 5 hours, 32 minutes, 45 seconds
- 1 hour, 7 minutes, 28 seconds
- 12 hours, 55 minutes
- 6 hours, 5 minutes, 39 seconds
- Write the following times using a.m. or p.m.
- The movie starts at 6:45 in the evening.
- Your friend calls and wakes you up at 3:23 in the morning.
- Your dog barks at the mailman at 2:35 in the afternoon.
- Your morning break is at 10:15.
- Round the following times to the nearest hour.
- You took a walk for 47 minutes.
- Your round trip (there and back) to the mall took 2 hours and 12 minutes.
- Circle the correct shape in each line.
- A triangle
- A square
- The following things give the idea of a shape. Write the name of the shape in each blank.
- A window is a .
- A checkerboard is a .
- A watch is a .
- A yield sign is a .
- Word Problems. Estimate the following answers. Be sure to round to the nearest 10 before adding or subtracting. Be sure to circle the information and underline what’s being asked.
- The Sears Tower is 443 metres tall. It has a 105 metre TV antenna on top. Estimate the height of the building and the antenna.
- A restaurant used 76 kilograms of potatoes and 68 kilograms of meat. Estimate how many kilograms of potatoes and meat the restaurant used altogether.
- Paolo’s father weighs 78 kilograms. Paolo weighs 29 kilograms. Estimate how much more Paolo’s father weighs.
- Chi bought 54 litres of gasoline on Tuesday. He ought 38 litres of gasoline on Friday. Estimate how many litres of gas he bought altogether.
Answers to Unit 4 Review
-
- 50
- 90
- 60
- 90
- 90
- 60
- 60
- 50
-
- 880
- 760
- 490
- 780
- 680
- 1090
- 950
- 570
-
- 10
- 30
- 20
- 60
- 40
- 30
- 40
- 60
-
- 220
- 500
- 850
- 620
- 420
- 200
- 270
- 740
-
- 10:20:12
- 8:45:06
- 5:32:45
- 1:07:28
- 12:55
- 6:05:39
-
- 6:45 p.m.
- 3:23 a.m.
- 2:35 p.m.
- 10:15 a.m.
-
- 1 hour
- 2 hours
-
-
- rectangle
- square
- circle
- triangle
-
- 550 metres
- 50 kilograms
- 150 kilograms
- 90 litres