PLACE VALUE & FORMS
Write 4,326 in expanded form.
4,000 + 300 + 20 + 6
Round 47 to the nearest ten.
50
Find the sum: 234 + 125.
359
Find the difference: 75 − 32.
43
Best estimate for 398 + 201?
A) 500 D) 800
B) 600 C) 700
B
What is the value of the 7 in 3,742?
700
Round 342 to the nearest hundred.
300
Find the partial sums for 423 + 256.
400 + 200 = 600; 20 + 50 = 70; 3 + 6 = 9; total 679.
Decompose to solve 527 − 288.
239. Example: 527 − 200 = 327; −80 = 247; −8 = 239.
A student says 49 + 26 can be changed to 50 + 25. Is the student correct why?
Yes. Both equal 75.
Write 5,208 in word form.
Five thousand two hundred eight.
Round 678 to the nearest ten.
680
What is the name for 12 and 10 in the addition problem 12+10=22
addends
What does it mean to decompose a number when subtracting?
Break it apart into smaller parts that are easier to subtract.
Solve 346 + 237 using partial sums.
583. 300+200=500; 40+30=70; 6+7=13; 500+70+13=583.
6 thousands + 3 hundreds + 4 tens + 9 ones = ?
6349
Estimate 387 + 214 by rounding each to the nearest hundred.
600=200+400
Use adjust to solve 398 + 125.
Ms. Jackson check answers
Use adjusting numbers to solve 369 − 125.
244. Example: 364 − 120 = 244.
Solve 704 − 298 using a strategy of your choice.
406. Example: 706 − 300 = 406.
Which is greater: 4,806 or 4,860?
4860
Estimate 721 − 386 by rounding each to the nearest hundred.
700-400=300
Use adjusting numbers to solve 513 + 172.
685. Example: 510 + 175 = 685.
Use addition to solve 527 − 288. Think: 288 + ? = 527.
239
A school has 425 pencils and buys 278 more. How many pencils now? Explain a Unit 2 strategy.
703 pencils. Example: partial sums: 400+200=600; 20+70=90; 5+8=13; total 703