Addition or Subtraction Problem Solving

Find and explain the mistake.    
 5 - 3 + 2   = 5-5 = 0

• You did the subtraction wrong

• You did the addition first, but should have done the subtraction first.

• The additon is correct, but the subtraction is wrong.

• There is no mistake.

Is this bar model addition or subtraction?

• addition

• subtraction

Is this an addition problem or a subtraction problem?

• addition

• subtraction

What number goes first when solving this problem?

• 280

• 98

Find the sum of 12908; 456; 7843

Solve:
246 + 553 = ?

• 313

• 799

• 809

• 307

92 + 85 + 135 =

245 + 387 =

516 + 468 =

• 974

• 1,984

• 984

• 986

James have 90 marshmallows in the jar. He adds 382 more. How many marshmallows are now in the jar? 

• 472

• 289

• 340

• 198