Testinar Grade 4 math

Adding and Subtracting Multi-Digit Whole Numbers

Students will fluently add and subtract multi-digit whole numbers and explain how place value supports the algorithm.

CH02-04 Number and Operations in Base Ten

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

What is \(8{,}432-3{,}657\)?
1. \(4{,}225\)
2. \(5{,}775\)
3. \(5{,}225\)
4. \(4{,}775\)
Add: \(5{,}234 + 2{,}145 =\)?
1. \(7{,}279\)
2. \(8{,}379\)
3. \(7{,}479\)
4. \(7{,}379\)
What is \(9{,}000 - 4{,}256\)?
1. \(4{,}744\)
2. \(5{,}244\)
3. \(4{,}244\)
4. \(5{,}744\)
Subtract: \(6{,}320 - 1{,}485 =\)?
1. \(4{,}835\)
2. \(5{,}835\)
3. \(4{,}935\)
4. \(5{,}935\)
Add: \(3{,}456 + 4{,}567 =\)?
1. \(8{,}012\)
2. \(7{,}913\)
3. \(7{,}923\)
4. \(8{,}023\)
What is \(10{,}000 - 5{,}678\)?
1. \(4{,}322\)
2. \(4{,}332\)
3. \(4{,}422\)
4. \(5{,}322\)
Add: \(7{,}285 + 1{,}514 =\)?
1. \(8{,}799\)
2. \(8{,}889\)
3. \(8{,}699\)
4. \(9{,}799\)
Add: \(12{,}345 + 23{,}456 =\)?
1. \(35{,}701\)
2. \(36{,}801\)
3. \(35{,}711\)
4. \(35{,}801\)

Teacher and parent reference

Answer key and explanations

D. \(4{,}775\)
Subtract column by column, regrouping as needed. Starting from the ones: we need to regroup the tens and higher places to complete the subtraction. The answer is \(\mathbf{4{,}775}\).
D. \(7{,}379\)
Add from right to left: ones \(4+5=9\), tens \(3+4=7\), hundreds \(2+1=3\), thousands \(5+2=7\). The sum is \(\mathbf{7{,}379}\).
A. \(4{,}744\)
Since we're subtracting from \(9{,}000\), we must regroup across the zeros to subtract in each place. The answer is \(\mathbf{4{,}744}\).
A. \(4{,}835\)
Start in the ones place: \(0 < 5\), so regroup one ten as \(10\) ones. Then subtract from right to left carefully. The answer is \(\mathbf{4{,}835}\).
D. \(8{,}023\)
Add from right to left: ones give \(13\) (write \(3\), carry \(1\)), tens give \(12\) (write \(2\), carry \(1\)), hundreds give \(10\) (write \(0\), carry \(1\)), thousands give \(8\). The sum is \(\mathbf{8{,}023}\).
A. \(4{,}322\)
Subtracting from \(10{,}000\) requires careful regrouping across all the zeros. The answer is \(\mathbf{4{,}322}\).
A. \(8{,}799\)
Add by place value: ones \(5+4=9\), tens \(8+1=9\), hundreds \(2+5=7\), thousands \(7+1=8\). The sum is \(\mathbf{8{,}799}\).
D. \(35{,}801\)
Add from ones: \(5+6=11\) (write \(1\), carry \(1\)), \(4+5+1=10\) (write \(0\), carry \(1\)), \(3+4+1=8\), \(2+3=5\), \(1+2=3\). The sum is \(\mathbf{35{,}801}\).