# 180 Days of Math for Fourth Grade Day 42 Answers Key

By accessing our 180 Days of Math for Fourth Grade Answers Key Day 42 regularly, students can get better problem-solving skills.

## 180 Days of Math for Fourth Grade Answers Key Day 42

Directions Solve each problem.

Question 1.  Explanation:
Perform subtraction operation on above two given numbers. Subtract 25 from 46 the difference is 21.

Question 2.
Color $$\frac{3}{10}$$.  = 3/10 x 100
= 3 x 10
= 30
Explanation:
Total number of boxes are 100. We have to shade 3/10 of the boxes. Multiply 3/10 with 100 the product is 30. So, 30 boxes are shaded.

Question 3.  Explanation:
Perform division operation on above two given numbers. Divide 18 by 9 the quotient is 2.

Question 4.
List all the factors of 12.
_____________
Factors of 12 are 1, 2, 4, 8, 16.
Explanation:
The numbers which divides 12 exactly leaving a remainder zero are the factors of 12. So, the factors of 12 are 1, 2, 4, 8, 16.

Question 5.
Write the ordinal number after sixteenth.
_____________
The ordinal number is used to represent the position. The ordinal number after sixteenth is seventeenth or 17th.

Question 6.
7 × = 21
7 × = 21
Explanation:
To get the product 21 we need to perform multiplication operation. Multiply 7 with 3 the product is 21. The missing multiplicand is 3.

Question 7.
Calculate the perimeter of a square with 5 cm sides.
_____________________ Given side = 5 cm
Perimeter of a square = 4 x side
= 4 x 5 cm
= 20 cm
The perimeter of a square with 5 cm sides is equal to 20 cm.

Question 8.
____ inches = $$\frac{1}{2}$$ foot
We know that 1 foot is equal to 12 inches.
Divide above equation by 2 on both sides.
1/2 foot = 12/2 inches
1/2 foot = 6 inches

Question 9.
True or false? Plane shapes are 3-dimensional.