# 180 Days of Math for Fourth Grade Day 58 Answers Key

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## 180 Days of Math for Fourth Grade Answers Key Day 58

Directions Solve each problem.

Question 1.

Explanation:
the difference between 53 and 7 is 46.

Question 2.
Write 0.99 as a fraction.
______________
$$\frac{99}{100}$$
Explanation:
To convert the decimal 0.99 to a fraction, just follow these steps:
Step 1: Write down the number as a fraction of one:
0.99 =$$\frac{0.99}{1}$$
Step 2: Multiply both top and bottom by 10 for every number after the decimal point:
As we have 2 numbers after the decimal point, we multiply both numerator and denominator by 100. So,
$$\frac{0.99}{1}$$= $$\frac{0.99 X100}{1 X100}$$  =  $$\frac{99}{100}$$

Question 3.

3
Explanation:

Question 4.
How many sevens are in 70?
10
Explanation:

Question 5.
Write the smallest 3-digit number using 2, 8, and 1.
_____________________
128
Explanation:

Everything, when counting, uses a positional index system. In decimal, we have ten characters. You know them:
0 1 2 3 4 5 6 7 8 9
and by putting those characters in a position we can count from any number to any number. In this case we have three characters (2,8, and 1) and so our number will be in the hundreds, as any three digit number is a minimum of 100 and a maximum of 999.
Decimal works by putting the least significant number rightmost and calling that units. To the left of that, we have tens, and to the left of the tens we have thousands, and so on. We actually want the smallest number so we go backwards, starting from the left and putting the hundreds in first. We need the smallest amount of hundreds we can get, and from our choices that’s 1.
1XX
Now we need to shove a value for the tens. We have 2 and 8 left to choose from, and again we need the smallest. That’s 2.
12X
Now we need the units. We don’t have much of a choice here because the only character we have left is 8. So then:
128

Question 6.
72 ÷ = 9
8
Explanation:
By our rule relating division and multiplication, we have the following:
If
72 ÷ c = 9
72 = c × 9
c= 72 ÷ 9
c=8
Question 7.
Record in milliliters.
______ mL

1100 mL
Explanation:
Mark showing between 1000 and 1200 so it is 1100mL

Question 8.
What is the temperature?
_______

Explanation:
Mark showing between 20 and 30.
30 -20=10
we have 5 small lines between 20 and 30.
10 ÷ 5 = 2
so each small line indicates 2.
we have mark at after 2 lines of 20. So it is 24.

Question 9.
Record the data in the chart.

 Child’s Name Number of CDs

Jahir has 23 music CDs.
Olivia has 15 music CDs.
Gerald has 35 music CDs.
Mimi has 3 music CDs.

 Child’s Name Number of CDs Jahir 23 Olivia 15 Gerald 35 Mimi 3

Explanation:
Completed the above information in data table.
A data table helps in the clear view of the data.

Question 10.
Plot each set of coordinates to make a rectangle.
(A, 2); (A, 5); (E, 2); (E, 5)