Problem Solving
Addition
Addition
321+546=_
867
344-215=_
129
15_9
Use any strategy.
25+16+31=_
71
Use any strategy.
340+312=_
652
219+486=_
705
985-899=_
86
45_99
<
Use booklet
48+21+54+71=_
194
Use Booklet strategy.
431+335=_
766
Tanjiro defeated 99 demons. His friend, Zenitsu defeated only 22 demons. Now they have 120 demons left to defeat. How many demons were there from the start?
241
Shinobu and Rengoku were assigned to defeat 500 demons in Tokyo. The first day they arrived in Tokyo, they were able to defeat 314 demons together. How many demons must they defeat tomorrow in order to have peace in Tokyo?
186
354_940
670_311
400_400
Less than <
Greater than >
Equal =
Use expansion form
63+27+81+93=_
264
Use expansion form.
643-215=_
428
Donald ate 25 cookies on Monday. He ate more on Tuesday. Then he ate 30 cookies on Wednesday! He ate a total of 90 cookies. How many cookies did Donald eat on Tuesday?
35
Dawn makes 49 cookies for her pokemon on Monday. Then, she make 34 cookies on Tuesday. Dawn's goal is to make 300 cookies by tomorrow! How many more cookies does she need to make?
217 cookies
5,041_6,441
4,443_4344
3333_3333
Less than <
Greater than >
Equal =
Use HTO
54+16+70+32=_
172
Use HTO.
985-321=_
664
Jessianna had her party at the beach. She invited 30 people. 10 people came in the morning and 15 more people came at lunch. How many people came in total and how many did NOT come?
25 people
5 people
Christopher had 600 dollars in his pocket. He gave 250 dollars to Holden as his birthday present. Then, Christopher spent 100 dollars on his toy (Roblox gift card). How many money does Christopher have left?
250
Explain what a comparison is and what method do we use? How do you know what is greater, less and equal?
To compare 2 numbers.
Crocodile Method
Greater than (the crocodile faces the left side)
Less than (the crocodile faces the right side)
Equal (there is two lines going up and down or crocodile is smiling)
Use Number line.
44+99+53+18=_
214
Use Number line.
22+41+35+120=_
218