Adding Decimals
34.5 + 23.94
58.44
24.5 - 10.23
14.27
Round the following to the nearest tenths:
(a) 456.78
(b) 10.566
(c) 0.988
(a) 456.8
(b) 10.6
(c) 1
I buy a pair of jeans for $19.99 and a pair of sneakers for $74.99. How much did I spent in total?
$94.98
This property states that you can add numbers in any order.
Commutative Property
103.4 + 8.988
112.388
509 - 311.4
197.6
Round the following to the nearest ones...
(a) 435.23
(b) 9.883
(c) 32.33
(a) 435
(b) 10
(c) 32
I spent $101.87 on books. I paid with $150. How much change do I receive?
$48.13
This property states that the sum of any number and 0 equals the number.
Identity Property of Addition
1,897.43 + 6,980.0003
8,877.4303
45,009 - 34,876.45
10,132.55
What is the process for rounding?
-Underline the digit we are rounding
-Look at the digit to the right...if it is 5 or up then round the number...if it is less than 5 then it stays
-everything to the left stays, everything to the right becomes zero (include your decimal if there is one)
About how much did I spend if I bought the following items...
socks for $5.99
pajamas for $23.75
slippers for $8.25
About $38
This property states that the way in which numbers are grouped does not change the sum or product.
Associative Property
894.34 + 23.578 + 122.345
1,040.263
345.9 - 100.3 - 50
195.6
What are three ACCURATE different places I can round the following number to that would make the most sense?
94.567
lots of answers!
$31,933,522.1
Write an example where you must use the Associative Property AND Commutative Property.
Lots of answers!
34,567.94 + 12,456.009 + 103,293.882
150,317.831
45,971 - 30,598.23 - 9,000.06
6,372.71
Add AND subtract the following after you round to the hundredths.
9,456.781 and 6,349.999
15,806.78
3,106.78
I spent $54.67 on a basketball, $109.45 on a jersey, and $32.38. They received $10.75 in change. How much did they pay with?
$207.25
Why does the Additive Identity of Addition work?
Anything plus 0 is itself because 0 is not adding anything to the number.