Testinar Grade 3 math

Fluently Multiply and Divide Within 100

Students will multiply and divide fluently within 100 using accurate and efficient strategies.

CH01-07 Operations and Algebraic Thinking

Directions Solve each problem. Show your reasoning on the page or on separate paper. Check the answer key only after finishing.

What is \(7\times9\)?
1. \(56\)
2. \(63\)
3. \(70\)
4. \(81\)
What is \(6\times8\)?
1. \(42\)
2. \(56\)
3. \(54\)
4. \(48\)
What is \(4\times7\)?
1. \(28\)
2. \(32\)
3. \(35\)
4. \(39\)
Which equation is true?
1. \(3\times6=19\)
2. \(9\times3=28\)
3. \(8\times5=42\)
4. \(5\times6=30\)
What is \(72\div8\)?
1. \(8\)
2. \(9\)
3. \(10\)
4. \(64\)
What is \(5\times9\)?
1. \(40\)
2. \(54\)
3. \(50\)
4. \(45\)
What is \(32\div4\)?
1. \(6\)
2. \(7\)
3. \(8\)
4. \(9\)
What is \(9\times4\)?
1. \(32\)
2. \(35\)
3. \(36\)
4. \(40\)

Teacher and parent reference

Answer key and explanations

B. \(63\)
\(7\times9=63\). Think: \(7\times10=70\), then subtract one group of \(7\): \(70-7=63\). Choice C is \(7\times10\); choice A is \(7\times8\).
D. \(48\)
\(6\times8=48\). You can think of \(6\) groups of \(8\), or \(8\) groups of \(6\).
A. \(28\)
\(4\times7=28\). Count by \(7\)s four times: \(7, 14, 21, 28\).
D. \(5\times6=30\)
\(5\times6=30\) is correct. The other answers are: \(3\times6=18\), \(8\times5=40\), and \(9\times3=27\).
B. \(9\)
\(72\div8=9\) because \(9\times8=72\). Division and multiplication are related. Choice D (\(64\)) is \(8\times8\), a common mistake.
D. \(45\)
\(5\times9=45\). Count by \(5\)s: \(5, 10, 15, 20, 25, 30, 35, 40, 45\).
C. \(8\)
\(32\div4=8\) because \(8\times4=32\). You need \(4\) groups with \(8\) in each group.
C. \(36\)
\(9\times4=36\). You can think of \(4\) nines or \(9\) fours: \(9+9+9+9=36\).