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)
8
9
+ 4 ________
21
( )
2)
3
10
+ 2 ________
15
( )
3)
8
4
+ 1 ________
13
( )
4)
7
2
+ 9 ________
18
( )
5)
2
2
+ 9 ________
13
( )
6)
2
1
+ 3 ________
6
( )
7)
2
5
+ 6 ________
13
( )
8)
1
2
+ 7 ________
10
( )
9)
3
2
+ 6 ________
11
( )
10)
7
6
+ 5 ________
18
( )
1)
8
9
+ 4 ________
21
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 17.
First, add 8 and 9 to make a 17: 8+9 + 4 =
17 + 4 =
Now add 17 and 4:
17 + 4 = 21
The sum is 21.
2)
3
10
+ 2 ________
15
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 13.
First, add 3 and 10 to make a 13: 3+10 + 2 =
13 + 2 =
Now add 13 and 2:
13 + 2 = 15
The sum is 15.
3)
8
4
+ 1 ________
13
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 12.
First, add 8 and 4 to make a 12: 8+4 + 1 =
12 + 1 =
Now add 12 and 1:
12 + 1 = 13
The sum is 13.
4)
7
2
+ 9 ________
18
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 9.
First, add 7 and 2 to make a 9: 7+2 + 9 =
9 + 9 =
Now add 9 and 9:
9 + 9 = 18
The sum is 18.
5)
2
2
+ 9 ________
13
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 4.
First, add 2 and 2 to make a 4: 2+2 + 9 =
4 + 9 =
Now add 4 and 9:
4 + 9 = 13
The sum is 13.
6)
2
1
+ 3 ________
6
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 3.
First, add 2 and 1 to make a 3: 2+1 + 3 =
3 + 3 =
Now add 3 and 3:
3 + 3 = 6
The sum is 6.
7)
2
5
+ 6 ________
13
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 7.
First, add 2 and 5 to make a 7: 2+5 + 6 =
7 + 6 =
Now add 7 and 6:
7 + 6 = 13
The sum is 13.
8)
1
2
+ 7 ________
10
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 3.
First, add 1 and 2 to make a 3: 1+2 + 7 =
3 + 7 =
Now add 3 and 7:
3 + 7 = 10
The sum is 10.
9)
3
2
+ 6 ________
11
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 5.
First, add 3 and 2 to make a 5: 3+2 + 6 =
5 + 6 =
Now add 5 and 6:
5 + 6 = 11
The sum is 11.
10)
7
6
+ 5 ________
18
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 13.