Odds and Evens
Are there an even or odd number of circles here:
O O O O O
How do you know?
There are 5 circles. Five is an odd number. You know because if you pair up the circles, there is a circle without a partner.
7 + 4
11
8 - 3
5
Ms. Aiken made donuts for her class. She made 9 donuts on Monday and 6 donuts on Tuesday. How many donuts did Ms. Aiken make in all? Please write the equation and answer that represents the problem.
9 + 6 = 15
Jose has 3 Pokemon cards. Jimmy gives Jose 9 more Pokemon cards. Ronnie gives Jose 7 Pokemon cards. How many Pokemon cards does Jose have now?
3 + 9 + 7 = 19
or
3 + 9 = 12 and 12 + 7 = 19
Is 8 an even or an odd number? How do you know?
8 is an even number because if you have eight objects, you can pair them together without one left over.
23 + 15
38
18 - 6
12
Ms. Trent and Ms. Wallace are playing soccer. Ms. Sarantis scored 12 goals. Ms. Wallace scored 9 goals. How many more goals did Ms. Trent score than Ms. Wallace? Please write the equation and answer that represents this problem.
12 - 9 = 3
Azennet has 13 muffins. She gives 6 muffins to Eliana. Terry gives Azennet 8 more muffins. How many muffins does Azennet have now?
13 - 6 + 8 = 15
or
13 -6 = 7 and 7 + 8 = 15
Is 15 an even or an odd number? Explain your thinking.
15 is an odd number. With a two-digit number you use the number in the ones place (5) to decide if a number is even or odd.
The missing number is 13.
8 - _____ = 2
The missing number is 6
Mr. Allen had some Pokemon cards. Ms. Hickson gave him 24 more Pokemon cards. Now Mr. Allen has 45 Pokemon cards. How many Pokemon cards did Mr. Allen have at the beginning?
____ + 24 = 45 therefore to find the answer we take the sum 45 - 24 to find the other part.
45- 24 = 21
Mr. Allen had 21 Pokemon cards in the beginning.
Ahmere loves cookies. He has 12 cookies. He gives 5 cookies to his brother, Christopher. Ahmere makes 9 more cookies. How many cookies does Ahmere have now?
12 - 5 + 9 = 16
or 12 - 5 = 7 and 7 + 9 = 16
Is 30 an even or an odd number? Explain your answer.
Numbers that end in zero are even numbers. If you were to pair 30 blocks, each would have a partner with none left over.
____ + 8 = 9 + 4
The missing number is 5
15 - ______ = 8 - 6
Since 8-6 equals 2, the missing number is 13 since 15 - 13 equals 2.
Ms. Hickson has a collection of snowglobes. She gave 17 snowglobes to her students. Now, Ms. Hickson has 51 snowglobes. How many snowglobes did Ms. Hickson have in the beginning?
______ - 17 = 51 therefore
51 + 17 will find the whole number at the beginning of the equation.
51 + 17 = 68 so Ms. Hickson had 68 snowglobes in the beginning.
Abigail buys 8 grapes from the grocery store. She eats 4 grapes on Monday and 3 grapes on Tuesday. How many grapes does Abigail have remaining?
8 - 4 - 3 = 1
or
8 - 4 = 4 and 4 - 3 = 1
Ms. Wilson says the number of X's below are an odd number. Do you agree. Yes or No? Explain your thinking.
X X X X X X X X X X
There are 10 X's. There is a zero in the ones place. Since zero is an even number, Ms. Wilson is incorrect.
14 - 2 = 3 + _____
Since 14 - 2 equals 12, the equation must be 3 + 9 for both sides to be equal.
2 + 7 = 10 - ____
2 + 7 = 9 so the missing number is 1 since 10 - 1 also equals 9
Ms. Wallace loves to exercise. Ms. Wallace did 61 jumping jacks. Ms. Coffman did 38 jumping jacks. How many more jumping jacks did Ms. Wallace complete than Ms. Coffman? Write an equation and answer to this problem.
61 - 38 = 23
Mr. Lin completed 23 more jumping jacks than Ms. Callender.
Skylar gets 47 minutes on her ipad every day. Ashlie gets 15 more minutes on her ipad than her Skylar. How many minutes does Ashlie get on her ipad?
47 + 15 = 62