Question

name:
weekly math review -
monday
order the numbers from greatest to least.
circle all t
332 233 323
8
round each number to the nearest 10.
round e
75
283
128
199
553
find the sum.
estima
249
+548
find the difference.
estim
825
-385
find the missing addend.
find
78 + = 99
fill in the blanks.
dr
____ groups of ____
solve.
4+4+4= ____ 2+2+2+2+2= ____
7+7+7+7= ____ 3+3= ____
9+9+9+9= ______

Explanation:

Step1: Compare the numbers

Compare 332, 233, 323.
332 has the highest hundreds digit (3), then 323 (hundreds digit 3 but tens digit 2 < 3 in 332), then 233 (hundreds digit 2).
So the order from greatest to least is 332, 323, 233.

Step2: Round 75 to the nearest 10

Look at the units digit. For 75, units digit is 5. When rounding to the nearest 10, if units digit ≥ 5, round up. So 75 rounds to 80.

Step3: Round 283 to the nearest 10

Units digit is 3 < 5. So 283 rounds to 280.

Step4: Round 199 to the nearest 10

Units digit is 9 ≥ 5. So 199 rounds to 200.

Step5: Calculate 249 + 548

Add units digits: 9 + 8 = 17, write down 7 and carry over 1.
Add tens digits: 4 + 4+1 (carry - over) = 9.
Add hundreds digits: 2 + 5 = 7. So 249 + 548 = 797.

Step6: Calculate 825 - 385

Subtract units digits: 5 - 5 = 0.
Subtract tens digits: 2 - 8. Since 2 < 8, borrow 1 from hundreds digit. 12 - 8 = 4.
Subtract hundreds digits: 7 (after borrowing) - 3 = 4. So 825 - 385 = 440.

Step7: Find the missing addend

Let the missing addend be \(x\). Using the equation \(78 + x=99\). Then \(x = 99 - 78\).
Subtract units digits: 9 - 8 = 1.
Subtract tens digits: 9 - 7 = 2. So \(x = 21\).

Step8: Count the groups and elements

There are 6 groups of 3 (count the number of ovals (groups) and dots in each oval (elements)).

Step9: Calculate \(4 + 4+4\)

\(4+4 + 4=12\).

Step10: Calculate \(2+2+2+2+2\)

\(2+2+2+2+2 = 10\).

Step11: Calculate \(7+7+7+7\)

\(7+7+7+7=28\).

Step12: Calculate \(3 + 3\)

\(3+3=6\).

Step13: Calculate \(9+9+9+9\)

\(9+9+9+9=36\).

Answer:

• Order of numbers: 332, 323, 233
• Rounded values: 75 → 80, 283 → 280, 199 → 200
• Sum: \(249 + 548=797\)
• Difference: \(825 - 385 = 440\)
• Missing addend: \(21\)
• Groups and elements: 6 groups of 3
• Sums: \(4 + 4+4 = 12\), \(2+2+2+2+2=10\), \(7+7+7+7 = 28\), \(3+3=6\), \(9+9+9+9=36\)