Scroll:Addition - one digit >> Adding doubles >> mcq (4010)
Written Instructions:
For each Multiple Choice Question (MCQ), four options are given. One of them is the correct answer. Make your choice (1,2,3 or 4). Write your answers in the brackets provided..
For each Short Answer Question(SAQ) and Long Answer Question(LAQ), write your answers in the blanks provided.
Leave your answers in the simplest form or correct to two decimal places.
1)
2
7
+ 1 ________
10
( )
2)
1
10
+ 10 ________
21
( )
3)
2
10
+ 7 ________
19
( )
4)
5
2
+ 6 ________
13
( )
5)
9
9
+ 4 ________
22
( )
6)
0
1
+ 9 ________
10
( )
7)
1
3
+ 4 ________
8
( )
8)
0
2
+ 10 ________
12
( )
9)
7
1
+ 1 ________
9
( )
10)
8
7
+ 3 ________
18
( )
1)
2
7
+ 1 ________
10
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 9.
First, add 2 and 7 to make a 9: 2+7 + 1 =
9 + 1 =
Now add 9 and 1:
9 + 1 = 10
The sum is 10.
2)
1
10
+ 10 ________
21
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 11.
First, add 1 and 10 to make a 11: 1+10 + 10 =
11 + 10 =
Now add 11 and 10:
11 + 10 = 21
The sum is 21.
3)
2
10
+ 7 ________
19
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 12.
First, add 2 and 10 to make a 12: 2+10 + 7 =
12 + 7 =
Now add 12 and 7:
12 + 7 = 19
The sum is 19.
4)
5
2
+ 6 ________
13
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 7.
First, add 5 and 2 to make a 7: 5+2 + 6 =
7 + 6 =
Now add 7 and 6:
7 + 6 = 13
The sum is 13.
5)
9
9
+ 4 ________
22
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 18.
First, add 9 and 9 to make a 18: 9+9 + 4 =
18 + 4 =
Now add 18 and 4:
18 + 4 = 22
The sum is 22.
6)
0
1
+ 9 ________
10
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 1.
First, add 0 and 1 to make a 1: 0+1 + 9 =
1 + 9 =
Now add 1 and 9:
1 + 9 = 10
The sum is 10.
7)
1
3
+ 4 ________
8
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 4.
First, add 1 and 3 to make a 4: 1+3 + 4 =
4 + 4 =
Now add 4 and 4:
4 + 4 = 8
The sum is 8.
8)
0
2
+ 10 ________
12
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 2.
First, add 0 and 2 to make a 2: 0+2 + 10 =
2 + 10 =
Now add 2 and 10:
2 + 10 = 12
The sum is 12.
9)
7
1
+ 1 ________
9
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 8.
First, add 7 and 1 to make a 8: 7+1 + 1 =
8 + 1 =
Now add 8 and 1:
8 + 1 = 9
The sum is 9.
10)
8
7
+ 3 ________
18
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 15.