Question

circle all the odd numbers.
87 24 54 83 99 38
round each number to the nearest 100.
128 ______ 976 ______
553 ________
estimate the sum of 299 and 388.
estimate the difference between 206 and 167.
find the missing addend.
________ + 64 = 177
draw an array for 3 x 5
what multiplication problem is being modeled by this array?

Explanation:

Step1: Identify odd numbers

Odd numbers are not divisible by 2.
87: \(87\div2 = 43.5\) (odd)
24: \(24\div2=12\) (even)
54: \(54\div2 = 27\) (even)
83: \(83\div2=41.5\) (odd)
99: \(99\div2 = 49.5\) (odd)
38: \(38\div2=19\) (even)

Step2: Round numbers to nearest 100

For 128: \(128\), the tens digit is 2 (\(<5\)), so \(128\approx100\)
For 976: \(976\), the tens digit is 7 (\(\geq5\)), so \(976\approx1000\)
For 553: \(553\), the tens digit is 5 (\(\geq5\)), so \(553\approx600\)

Step3: Estimate sum of 299 and 388

Round 299 to 300 and 388 to 400. Then \(300 + 400=700\)

Step4: Estimate difference of 206 and 167

Round 206 to 200 and 167 to 200. Then \(200-200 = 0\) (or round 206 to 200 and 167 to 170, \(200 - 170=30\))

Step5: Find missing addend

Let the missing addend be \(x\). Then \(x+64 = 177\), so \(x=177 - 64=113\)

Step6: Analyze array for \(3\times5\)

An array for \(3\times5\) has 3 rows and 5 columns (or vice - versa)

Step7: Determine multiplication problem from given array

The given array has 6 rows and 4 columns, so the multiplication problem is \(6\times4\)

Answer:

• Odd numbers: 87, 83, 99
• Rounding: 128 → 100; 976 → 1000; 553 → 600
• Estimated sum: 700
• Estimated difference: 30 (or 0 depending on rounding method)
• Missing addend: 113
• Array for \(3\times5\): 3 rows of 5 elements (or 5 rows of 3 elements)
• Multiplication problem for given array: \(6\times4\)