Mental Math
Which number is 10 less than 628?
618
279-157=?
122
DECOMPOSE- Italic number
319-127=?
100+20+7
Using Count on, Which equation us related to 419-158?
A. 158+419=?
B. 158+?=419
C. ?-158=419
D. 419+158=?
B.158+?=419
Is regrouping needed?
172-45
Yes
285-10=?
275
386-105=?
281
DECOMPOSE- Italic number
516-320=?
300+20+0
333-212=
Count On, Use the number line to change and find the difference
121
598-378=
Yes
198-100
98
Mateo has 725 football cards. He gives away 205 cards. How many football cards does Mateo still have?
520
How can you decompose to find the difference?
Show on the number line
413-256=?
157
-6 -50 -200
<--------------------------------------------->
157 413
671-352=
Count On Use the number line to change and find the difference
319
What is the difference? 234-125=
109
Amari does 85 push ups. Evan does 10 fewer push up. How many push up does Evan do?
75
Molly scores 365 points. She loses 124 points. How many points does Molly have left?
Use base-ten blocks to represent
241
614-388=? SHOW ON NUMBER LINE
-4 -70 -314
<------------------------------------- --------------->
226 230 300 614
Marissa gas 356 e-mail messages in her inbox. She deletes 108 e-mail messages. How many e-mail messages are left in Marissa's inbox? Write an equation to represent the problem. Use the number line to count on.
356-108=248
Is regrouping needed? 456-234
No
Kayla is working with a team to plant 772 trees at a park. They already plant 100 trees. How many more trees do they need to plant?
672
How do you represent this problem using BASE-TEN BLOCKS
224-113=?
2 Hundreds, 2 tens, 4 ones. Cross out
1 Hundreds, 1 tens, 3 ones
ANSWER: 111
Riley's dad can drive his car 383 miles on a full tank of gas. Riley's mom can drive her car 500 miles on a full tank of gas. How many more miles can her mom drive her car than her dad on a full tank of gas?
117 miles
After playing five basketball games, the Rockets scored a total of 368 points and the blazers scored a total of 475 points. How many more points did the blazers score than the rockets?
475-368=107
Davis has a box of 842 photos. He puts 426 photos in album. How many more photos are still in the box?
416