Primary 1 Mathematics Flashcards: Finding Missing Numbers in Open Sentences

Question 1

The 'counting on' method finds a missing number by counting up from the number you ____.

Accepted Answer

already have

Question 2

To find the missing number in $6 + \square = 9$ we count on from 6 to ____.

Accepted Answer

9

Question 3

What number completes $6 + \square = 9$?

Accepted Answer

3

Question 4

What number completes $4 + \square = 9$?

Accepted Answer

5

Question 5

What number completes $3 + \square = 8$?

Accepted Answer

5

Question 6

What number completes $2 + \square = 7$?

Accepted Answer

5

Question 7

What number completes $5 + \square = 7$?

Accepted Answer

2

Question 8

What number completes $1 + \square = 6$?

Accepted Answer

5

Question 9

What number completes $7 + \square = 10$?

Accepted Answer

3

Question 10

What number completes $8 + \square = 10$?

Accepted Answer

2

Question 11

What number completes $9 + \square = 12$?

Accepted Answer

3

Question 12

What number completes $10 + \square = 15$?

Accepted Answer

5

Question 13

What number completes $\square + 3 = 6$?

Accepted Answer

3

Question 14

What number completes $\square + 5 = 9$?

Accepted Answer

4

Question 15

Ada has 5 sweets and gets some more. Now she has 8. She got ____ sweets.

Accepted Answer

3

Question 16

A shelf has 6 books. Some more are added. Now it has 9. ____ books were added.

Accepted Answer

3

Question 17

Tunde says $4 + 3 = 8$. The correct total is ____.

Accepted Answer

7

Question 18

To check that $5 + 2 = 7$ is correct, we can count on from ____ two times.

Accepted Answer

5

Question 19

Using pebbles, bottle tops or fingers can help us to find a missing ____.

Accepted Answer

number

Question 20

An open sentence is true when the missing number makes both sides ____.

Accepted Answer

equal

Strong work.