Place Value
What is the value of the 7 in 473?
70
Write 426 in expanded form.
400 + 20 + 6
Solve: 230 + 140.
370
What does it mean to regroup in addition?
Example: Trade 10 ones for 1 ten or 10 tens for 1 hundred.
A class has 120 pencils & gets 80 more. How many pencils now?
200 pencils
How many tens are in 6 hundreds, 8 tens, & 2 ones?
8 tens
Write this number in standard form: 300 + 70 + 9.
379
Solve: 358 + 200.
558
Solve: 146 + 238.
384
A library has 245 fiction books & 132 nonfiction books. How many altogether?
377 books
What number has 5 hundreds, 14 tens, & 3 ones?
643
What number is represented by 4 hundreds, 12 tens, & 5 ones?
525
Solve: 275 + 146.
421
Solve: 367 + 185. Explain what happens to the ones.
552
Example: 7 + 5 = 12 ones, so regroup 10 ones as 1 ten.
A school collected 378 cans on Monday & 246 on Tuesday. How many cans did they collect?
624 cans
Regroup 1 hundred as tens. How many tens do you get?
10 tens
Solve: 487 + 268. Show how you know.
Example: 600 + 80 and 500 + 180
Solve: 487 + 268. Show how you know.
755
A designer solves 248 + 176 and gets 314. Find the correct sum.
424
A designer says 295 + 306 = 501. Is the designer correct? Explain.
No. The correct sum is 601.
In 758, how could you regroup the number to have 6 hundreds instead of 7?
6 hundreds, 15 tens, & 8 ones
Find 396 + 287 using a strategy other than the standard algorithm.
For example: 7 hundreds, 3 tens, 4 ones; 6 hundreds, 13 tens, 4 ones
Find 396 + 287 using a strategy other than the standard algorithm.
683
Solve 576 + 287 using an addition algorithm. Explain each regrouping.
863
Example: Regroup 13 ones as 1 ten & 3 ones; then 16 tens as 1 hundred & 6 tens.
Two classes collected 468 & 357 stickers. They want to collect 900 stickers. How many more do they need?
75 more stickers.
Example: 468 + 357 = 825 then
900 − 825 = 75.