Thursday Homework

24.789 x 100

Answer explanation

When you multiply by 100, you simply have to move the decimal over TWO places to the RIGHT because 100 has 2 zeroes! If I would multiply by 1000, you would move 3 places to the right, and multiply by 10 you would move decimal one place to right.

Tags

CCSS.5.NBT.A.2

CCSS.5.NBT.B.7

Is the 5 in the number 23.45 ten times greater or 1/10 of the 5 in the number 98.54?

• 10 times greater

• 1/10 of

Answer explanation

When you move left to right with place value the place value is getting larger.

The first 5 is worth less than the second 5 therefore it is 1/10 of (remember 1/10 of simply means 10 times smaller than)

Tags

CCSS.5.NBT.A.1

Which would be the standard form of this number?

(4 x 100) + ( 6 x 10) + (9 x 0.001)

Answer explanation

This is all about place value. 4 x 100 = 400 so 4 has to be in the hundreds spot, 6 x 10 = 60 so there is a 6 in tens spot, and then 9 x 0.001 = .009 so a 9 has to be in the thousandths place. Since they are not multiplying anything by ones, tenths, or hundredths, you have to put 0's in for that place value. Hence why the answer is 460.009

Tags

CCSS.5.NBT.A.1

CCSS.5.NBT.A.3

CCSS.5.NBT.B.7

What is 25.998 rounded to the nearest whole number?

Mathematical Equivalence

ON

Answer explanation

Rounding to the nearest whole number means the ONES PLACE. If I have 25.99 the 5 is in the ones place therefore it has to stay a 5 or bump up to a 6. Everything to the left stays the same and everything to the right of it becomes a 0. 25.99 would round to 26.

Tags

CCSS.5.NBT.A.4

Round 12.827 to the nearest hundreths.

Mathematical Equivalence

ON

Answer explanation

Just like the last problem, what digit is in the hundredth place? The 2 is. Look next door, is that number 5 or greater? Yes! So, you have to make the 2 a 3 when you round. Everything to the left stays the same and everything to the right becomes a zero.

Tags

CCSS.5.NBT.A.4

Round 258.34 to the nearest tenth

Mathematical Equivalence

ON

Answer explanation

What place value is in the tenths place? The 3 is. Is the number to the right equal to or greater than 5. No. so the 3 stays a 3 in this problem. Everything to the right turns in to a 0 and everything to the left stays the same.

Tags

CCSS.5.NBT.A.4

What is the product of 123 x 45

Mathematical Equivalence

ON

Answer explanation

123

x 45

615

4920

5535

Are your Multiplication facts correct. Did you add the two numbers correct? Did you put a 0 in the ones place when you started to multiply by the tens place

Tags

CCSS.5.NBT.B.5

Mathematical Equivalence

OFF

Answer explanation

Follow PEMDAS

Remember you always do parentheses first so 7 - 4 = 3. Then you have to divide 9 divided by 3 because multiplication/division are the same and we do them left to right (whatever comes first). So we then are down to 3 + 3 x 2 so you have to multiply first. so 3 + 6. Final simplified answer is 9

Tags

CCSS.5.OA.A.1

CCSS.5.OA.A.2

Is the 2 in 2.56 ten times larger or 1/10 of the 2 in 1.2?

• 10 times

• 1/10 of

Answer explanation

The first 2 is in the ones place. The two in the second number is in the tenths place. Therefore $2 is ten times greater than 0.2.

Tags

CCSS.5.NBT.A.1

Write 0.98 as a fraction

Mathematical Equivalence

ON

Answer explanation

How do say this? 98 hundredths therefore you write it (using the fraction button on the right) as

98

100

Tags

CCSS.5.NBT.A.3