2 Addend Addition
What is 276+289?
565
Ms. Grady has 337 magnets. If Mrs. Brown gives Ms. Grady 285 more magnets, how many does Ms. Grady have now?
622 magnets!
Round 655 to the nearest tens.
660.
What is the sum of 243, 132, and 157?
532
What is 395+296?
691
If Danielle wants to write 683 in expanded form, what should her answer look like?
600+80+3
Find the estimated sum of 395, 162, and 149 by rounding to the nearest hundreds. Explain your answer.
700.
Draw a bar diagram that represents the sum of 181, 602, and 193. Then solve.
976.
What is the sum of 198+163?
361
Use mental math to add 332 and 154. Which of these shows how to break apart the numbers into hundreds, tens, and ones.
(A) Break 332 into 320 + 12. Break 154 into 125 + 29.
(B) Break 332 into 100+230+2. Break 154 into 100+50+2
(C) Break 332 into 300+30+2. Break 154 into 100+50+4.
(C) Break 332 into 300+30+2. Break 154 into 100+50+4.
Estimate the sum of 405+385 by rounding to the nearest hundred. Explain your answer.
400+400=800. I rounded 405 to 400 and 385 to 400.
Draw a bar diagram that represents 350+62+199.
...
Consider the equation 360=_____+84. Use a bar diagram to represent the equation. Then solve for the unknown value.
276
List all the options that are true:
(A) 32+56+10=10+56+32
(B) (49+28)+5=49+(28+5)
(C) 82+0=82
(D) 45+27=27+35
A, B, and C.
Find the estimated sum of 395, 162, and 149 by rounding to the nearest tens. Explain your answer.
710.
What is the first step you would do to solve this problem using mental math?
"Find the sum of 350+62+199."
Multiple responses are possible!
Example: First I find the sum of 350 and 199. 199 is 1 less than 200. So 350+199 is one less than 350+200. The sum is 549.