Addition
True or false?
The number 15 does not appear in the table.
True
Find the value of the difference. Explain or show your reasoning.
568 - 347
221
Diego has a collection of 225 baseball cards. He gets 35 more cards from a friend, then buys 72 cards. How many cards does Diego have now?
a. d = 225 + 35 + 72
b. d = 225 + 35 - 72
c. d = 225 + (35 x 72)
a. d = 225 + 35 + 72
At the assembly, there are 187 students from Zha'Nasiah's school and 229 students from Justin's school.
Round each number to the nearest ten. About how many students are at the assembly?
187 is about 190.
229 is about 230.
190 + 230 = about 420 students at the assembly
True or false?
The number 7 appears 4 times in the table.
True
Find the value of the difference. Explain or show your reasoning.
541 - 228
313
Elena has 7 notebooks. Each notebook has 10 paper clips in it. Elena also has a box of 225 paper clips. How many paper clips does Elena have?
a. 7 x 10 = 225
b. (7 x 10) + 225 = p
c. (7 x 10) - 225 = p
b. (7 x 10) + 225 = p
There are seats for 500 students in the auditorium. There are 187 students from Zha'Nasiah's school and 229 students from Justin's school. Justin estimates that there will be about 100 empty seats. Do you agree with him?
HINT: You estimated that there are about 420 students at the assembly. About how many seats should be empty?
500-420 = 80
No, we do not agree with Justin because we estimated 80 empty seats.
Count the number of odd and even numbers in the table. What could you say about them?
a. There are the same number of odd and even numbers.
b. There are more even numbers than odd numbers.
c. There are more odd numbers than even numbers.
b. There are more even numbers than odd numbers.
Find the value of the difference. Explain or show your reasoning.
200 - 136
64
Mai had 104 beads. She bought 2 more packs of beads and each pack has 10 beads in it. How many beads does she have now?
a. 104 + (2 ✕ 10) = b
b. b = 104 - (2 ✕ 10)
c. 2 x b = 104 + 10
a. 104 + (2 ✕ 10) = b
There are seats for 500 students in the auditorium. There are 187 students from Zha'Nasiah's school and 229 students from Justin's school. Justin estimates that there will be about 100 empty seats.
Do you think there will be more or less than 100 empty seats? (Hint: you estimated 80 empty seats.)
There will be less than 100 empty seats.
Find the value of the sum. Explain or show your reasoning.
456 + 145
601
Find the value of the difference. Explain or show your reasoning.
600 - 525
75
Mrs. Kane has 45 packs of smarties in a bag. She gives 3 students each 2 packs of smarties. How many smarties does Mrs. Kane have now?
a. s = 45 + 3 + 2
b. 45 - (3 x 2) = s
c. 45 + (3 x 2) = s
b. 45 - (3 x 2) = s
There are seats for 500 students in the auditorium. There are 187 students from Zha'Nasiah's school and 229 students from Justin's school.
How many empty seats will there be?
Part 1: just solve how many seats are used
187 + 229 = 416
Find the value of the sum. Explain or show your reasoning.
319 + 485
804
Find the value of the difference. Explain or show your reasoning.
500 - 416
84
Clare had 225 beads. A friend gave her a pack of 48 beads. Then she used 70 beads to make a necklace. How many beads does Clare have now?
a. 225 + (48 x 70) = b
b. 225 + 48 + 70
c. 225 + 48 - 70 = b
c. 225 + 48 - 70 = b
There are seats for 500 students in the auditorium. There are 187 students from Zha'Nasiah's school and 229 students from Justin's school.
How many empty seats will there be? (part 2)
Don't forget: you solved that 416 seats were taken!
500-416 = 84 empty seats