Make generalization
Odd + odd = ...........
Even
△ + 7 = 12
5
75 + 20 = ......
95
23 - 7 = .....
16
△ + △ + 9 = 17
△ = ?
△ = 4
Even + even = odd. True or false?
False
◯ - 5 = 9
14
97 + 33 = ......
130
105 - 26 = .......
79
15 + ☐ = 23
☐ + △ = 12
What is the value of ☐ - △ ?
☐ = 8 and △ = 4
So, ☐ - △ = 8 - 4
The answer is 4
Mia is subtracting two numbers and the result is odd. Ahmed says that one of the numbers must be odd. Prove it by giving an example.
Accept answers that prove it. For example: 3 - 2 = 1
◆ + 5 = 22
17
157 + 19 = ......
176
931 - 664 = ..........
267
A bookstore had 482 books in stock. They sold 196 books and then received 375 more books from the publisher. How many books are in stock now?
482 - 196 =286
286 + 375 = 661
There are 661 books in stock
Even + odd + even - odd = even. True or false?
True
A library starts with some books. After adding 22 more books to the collection, there are 45 books in total. How many books did the library have at the beginning?
23
A school sells 432 tickets for a play. They sell 167 more tickets the next day. How many tickets were sold in total?
599
A toy store had 762 toys in stock. They sold 389 toys during a big sale. How many toys are left in the store?
373
Emma had 524 books in her collection. She gave 178 books to her friend. How many books does Emma have now?
346
A puzzle has a total number of pieces. After losing 12 pieces, there are 28 pieces left. How many pieces did the puzzle originally have?
40
An orchard harvested 674 apples last week and 359 apples this week. How many apples did the orchard harvest in total?
1033
A theater had 936 movie tickets in the morning. In the afternoon, they sold 478 tickets. How many tickets were not sold yet?
458
An ice cream shop made 920 cones in the morning. By noon, 465 cones were sold, and 128 cones melted due to a broken freezer. How many cones are left?
327