Vocabulary
Numbers that are easy to add are _____________.
Friendly Numbers
How can you decompose one addend? Choose all the correct answers.
489+415
A. 489+400+1+5
B. 489+400+10+5
C. 400+8+9+415
D.400+80+9+415
B and D
Park rangers count 653 Bison and 100 elk at a nature preserve. How many bison and elk do they count?
753
544+167=
711
How can you decompose one addend to solve?
356+491=
356+400+90+1 OR 300+50+6+491
847
In the number 234, 2 is in the ________ place.
What addition strategy is shown?
273+684
200+600=800
70+80=150
3+4=7
800+150+7=957
A. Adjust addends
B. decompose both addends
C. decompose one addend
D. skip couting
B
This month, Trent spends 254 minutes at soccer practice and 184 minutes at soccer games. How much time does Trent spend at soccer practice and soccer games this month?
432+325=
757
Decompose both addends to solve:
764+229=
993
You ____________ a number by breaking it into different parts.
Decompose
Colleen read 361 pages in a book. She reads 10 more pages. How many pages has Colleen read in all?
A. 362
B. 371
C. 461
D. 471
B
Stacy sells cars and trucks. She has 378 cars and 245 trucks for sale. What is the total number of cars and trucks Stacy has for sale?
623
637+234=
871
Use base-ten shorthand to solve:
423+352=
775
You __________ to make an equation easier to solve.
Adjust
Which equations need regrouping? Choose all the correct answers.
A. 217+582=
B. 455+134=
C.346+471=
D.263+648=
C and D
There are 194 children and 330 adults at a play. How many people are at the play?
497
705+283=
988
Use place value to decompose both addends to solve:
592+135=
727
When adding _____________________ you add the digits in one place value at a time, and then add those sums to find the total sums.
partial sums
What addition strategy is shown?
598+236=834
+2 -2
600+234=834
A. adjust addends
B. decompose both addends
C. decompose one addend
D. skip counting
A
Tina adds 426+152 by place value. She decomposes the addends as 400+2+6 and 100+50+2. Tina says the sum is 515. How do you respond to her?
She is not correct. She did not decompose tens correctly. The correct answer is 578.
599+267=
866
Adjust addends to solve:
256+398=
654