Practice the problems of Math in Focus Grade 3 Workbook Answer Key Chapter 8 Practice 1 Mental Division to score better marks in the exam.
Math in Focus Grade 3 Chapter 8 Practice 1 Answer Key Mental Division
Think of the multiplication facts for 6, 7, 8, and 9. Then fill in the blanks.
Example
6 × 6 = 36 36 ÷ 6 = 6
Question 1.
___ × 7 = 35 35 ÷ 7 = ____
Answer:
5 × 7 = 35 35 ÷ 7 = 5
Explanation:
The inverse or opposite of division is multiplication.
It is called an Inverse operation
Question 2.
___ × 8 = 72 72 ÷ 8 = ____
Answer:
9 × 8 = 72 72 ÷ 8 = 9
Explanation:
The inverse or opposite of division is multiplication.
It is called an Inverse operation
Question 3.
___ × 9 = 63 63 ÷ 9 = ____
Answer:
7 × 9 = 63 63 ÷ 9 = 7
Explanation:
The inverse or opposite of division is multiplication.
It is called an Inverse operation
Question 4.
___ × 9 = 81 81 ÷ 9 = ____
Answer:
9 × 9 = 81 81 ÷ 9 = 9
Explanation:
The inverse or opposite of division is multiplication.
It is called an Inverse operation
Fill in the blanks
Question 5.
56 ÷ 7 = __ ones ÷ 7
= ___ ones
= _____
Answer:
56 ÷ 7 = 56 ones ÷ 7
= 8 ones
= 8
Explanation:
We have to convert the tens and ones to ones
as the tens cannot be divided directly
Question 6.
360 ÷ 9 = ___ tens ÷ 9
= ___ tens
= _____
Answer:
360 ÷ 9 = 36 tens ÷ 9
= 4 tens
= 40
Explanation:
We have converted the hundreds to tens
To make the division easier
Question 7.
600 ÷ 3 = ___ hundreds ÷ 3
= ____ hundreds
= ______
Answer:
600 ÷ 3 = 6 hundreds ÷ 3
= 2 hundreds
= 200
Explanation:
We have converted the 600 to ones
To make the division easier
Question 8.
4,500 ÷ 5 = ___ hundreds ÷ 5
= ___ hundreds
= ____
Answer:
4,500 ÷ 5 = 45 hundreds ÷ 5
= 9 hundreds
= 900
Explanation:
We have converted the 4500 to hundreds
To make the division easier
Divide. Use related multiplication facts and patterns to help you.
Question 9.
240 ÷ A = ___
Answer:
240 ÷ 4 = 60
Explanation:
Converted the number 240 to 24 tens
4 x 6 = 24
Question 10.
250 ÷ 5 = ____
Answer:
250 ÷ 5 = 50
Explanation:
Converted the number 250 to 25 tens
5 x 5 = 25
Question 11.
180 ÷ 9 = ___
Answer:
180 ÷ 9 = 20
Explanation:
Converted the number 180 to 18 tens
9 x 2 = 18
Question 12.
180 ÷ 6 = ___
Answer:
Question 12.
180 ÷ 6 = 30
Explanation:
Converted the number 180 to 18 tens
6 x 3 = 18
Question 13.
320 ÷ 8 = ___
Answer:
320 ÷ 8 = 40
Explanation:
Converted the number 320 to 32 tens
8 x 4 = 32
Question 14.
490 ÷ 7 = ___
Answer:
490 ÷ 7 = 70
Explanation:
Converted the number 490 to 49 tens
7 x 7 = 49