How to Multiply by a 1Digit Number
We will learn how to multiply any number by a onedigit number.
Multiplication of a 4Digit Number by a 1Digit Number:
1. Multiply 2154 and 4.
Solution:
Step I: Arrange the numbers vertically.
Step
II: First multiply the digit at the ones place by 4.
4 × 4 = 16 = 1 ten + 6 ones
Write 6 in the ones column and carry 1 ten to tens place.
Step III: Multiply the digit at the tens place by 4.
5 × 4 = 20 tens
20 + 1 (carried) = 21 tens = 2 hundreds + 1 ten
Write 1 in ten place and carry 2 hundreds to hundreds place.
Step IV: Multiply the digit at hundreds place by 4.
1 hundred × 4 = 4 hundreds
4 hundreds + 2 hundreds (carried) = 6 hundreds
Write 6 in hundreds place.
Step V: Multiply the digit at thousands place by 4.
2 thousands × 4 = 8 thousands
Write 8 in thousands place.
2. Multiply 7325 and 9.
Solution:
Step I: Arrange the numbers vertically.
Step II: First multiply the digit at the ones place by 9.
5 × 9 = 45 = 4 ten + 5 ones
Write 5 in the ones column and carry 4 tens to tens place.
Step III: Multiply the digit at the tens place by 9.
2 × 9 = 18 tens
18 + 4 (carried) = 22 tens = 2 hundreds + 2 ten
Write 2 in ten place and carry 2 hundreds to hundreds place.
Step IV: Multiply the digit at hundreds place by 9.
3 × 9 = 27 hundreds
27 hundreds + 2 hundreds (carried) = 29 hundreds = 2 thousands + 9 hundreds
Write 9 in hundreds place and carry 2 thousands to thousands place.
Step V: Multiply the digit at thousands place by 9.
7 thousands × 9 = 63 thousands
63 thousands + 2 thousands (carried) = 65 thousands = 6 ten thousands + 5 thousands
Write 5 in thousands place and 6 ten thousands in ten thousands place.
3. Multiply 2,634 by 3.
Solution:
Step I: Align the digits.
Th 
H 
T 
O  
2 
6 
3 
4  
× 
3 




Step II: Multiply ones.
4 ones × 3 = 12 ones = 1 ten 2 ones.
Write 2 in ones place and carry 1 to the tens place.
Th 
H 
T 
O  
1  
2 
6 
3 
4  
× 
3 



2 
Step III: Multiply tens.
3 tens × 3 = 9 tans.
9 tens + 1 ten (carried) = 10 tens = 1 hundred 0 tens
Write 0 in tens place and carry 1 to the hundreds place.
Th 
H 
T 
O  
1 
1  
2 
6 
3 
4  
× 
3 


0 
2 
Step IV: Multiply hundreds.
6 hundreds × 3 = 18 hundreds.
18 hundreds + 1 thousand (carried) = 19 hundreds = 1 thousand 9 hundreds. Write 9 in hundreds carry 1 to thousands place.

9 
0 
2 
Step V: Multiply thousands.
2 thousands × 3 = 6 thousands
6 thousands + 1 thousand (carried) = 7 thousands.
Write 7 in thousands place.
Th 
H 
T 
O  
1 
1 
1  
2 
6 
3 
4  
× 
3 
7 
9 
0 
2 
Therefore, the product of 2,634 and 3 = 7,902.
4. Multiply 6492 by 8.
Solution:
Worksheet on Multiplication by 1digit Number:
1. Multiplication of 4Digit Numbers by 1Digit Number by column method.
(i) 2031 × 3 = __________
(ii) 1347 × 2 = __________
(iii) 5120 × 4 = __________
(iv) 1227 × 7 = __________
(v) 2310 × 6 = __________
(vi) 3127 × 5 = __________
(vi) 4081 × 8 = __________
(vi) 5526 × 9 = __________
(ix) 8052 × 3 = __________
Answers:
(i) 6093
(ii) 2694
(iii) 20480
(iv) 8589
(v) 13860
(vi) 15635
(vi) 32648
(vi) 49734
(ix) 24156
2. Multiply the given 4Digit Numbers by 1Digit Number horizontally. Start from right. One has been done for you.
(ii) 2121 × 3 = __________
(iii) 3004 × 2 = __________
(iv) 9865 × 1 = __________
Answers:
(ii) 6363
(iii) 6008
(iv) 9865
4th Grade Math Activities
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