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)
9
7
+ 7 ________
23
( )
2)
3
7
+ 8 ________
18
( )
3)
3
1
+ 4 ________
8
( )
4)
2
3
+ 1 ________
6
( )
5)
8
9
+ 3 ________
20
( )
6)
2
6
+ 3 ________
11
( )
7)
4
8
+ 1 ________
13
( )
8)
4
1
+ 1 ________
6
( )
9)
5
9
+ 9 ________
23
( )
10)
10
10
+ 9 ________
29
( )
1)
9
7
+ 7 ________
23
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 16.
First, add 9 and 7 to make a 16: 9+7 + 7 =
16 + 7 =
Now add 16 and 7:
16 + 7 = 23
The sum is 23.
2)
3
7
+ 8 ________
18
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 10.
First, add 3 and 7 to make a 10: 3+7 + 8 =
10 + 8 =
Now add 10 and 8:
10 + 8 = 18
The sum is 18.
3)
3
1
+ 4 ________
8
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 4.
First, add 3 and 1 to make a 4: 3+1 + 4 =
4 + 4 =
Now add 4 and 4:
4 + 4 = 8
The sum is 8.
4)
2
3
+ 1 ________
6
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 5.
First, add 2 and 3 to make a 5: 2+3 + 1 =
5 + 1 =
Now add 5 and 1:
5 + 1 = 6
The sum is 6.
5)
8
9
+ 3 ________
20
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 + 3 =
17 + 3 =
Now add 17 and 3:
17 + 3 = 20
The sum is 20.
6)
2
6
+ 3 ________
11
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 8.
First, add 2 and 6 to make a 8: 2+6 + 3 =
8 + 3 =
Now add 8 and 3:
8 + 3 = 11
The sum is 11.
7)
4
8
+ 1 ________
13
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 12.
First, add 4 and 8 to make a 12: 4+8 + 1 =
12 + 1 =
Now add 12 and 1:
12 + 1 = 13
The sum is 13.
8)
4
1
+ 1 ________
6
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 5.
First, add 4 and 1 to make a 5: 4+1 + 1 =
5 + 1 =
Now add 5 and 1:
5 + 1 = 6
The sum is 6.
9)
5
9
+ 9 ________
23
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 14.
First, add 5 and 9 to make a 14: 5+9 + 9 =
14 + 9 =
Now add 14 and 9:
14 + 9 = 23
The sum is 23.
10)
10
10
+ 9 ________
29
SOLUTION 1 :
Hint: Start by adding first two of the numbers to make a 20.