Vocabulary
Circle the digit is in the tens place?
23
53
82
2
5
8
1. Which have a sum of 43? Use a hundred chart to solve. Choose all that apply.
33 + 10
28 + 13
10 + 33
19 + 24
10 + 21
33 + 10
10 + 33
19 + 24
3. Which equation does this number line show? (see #3 on your assessment practice.)
A. 57 + 28 = 85
B. 57 + 38 = 95
C. 57 + 33 = 90
D. 57 + 39 = 96
B
5. Colin has 54 pennies and 28 nickels. How many coins does Colin have?
Break apart the second addend to solve.
54 + 20 = 74
74 + 8= 82
8. Which numbers round to 70 when rounded to the nearest 10? Choose all that apply.
72
65
76
74
63
72
65
74
Circle the digit in the ones place?
34
43
97
4
3
7
2. Stacy has 63 crayons. She gets 25 more crayons. How many crayons does Stacy have in all? Use a hundred chart to solve.
88
4. (see # 4 on your Assessment Practice.)
Use the numbers on the cards. Write the missing numbers under the number line to show how to find the sum of 40 + 35 =
75 60 50 70
50, 60, 70, 75
6. Find 68 + 16.
Break apart the second addend. Then add using mental math. Show your work.
68 + 16=
68 + 10=78
78+ 6=84
9. Lisa has 27 markers. Adam has 22 markers. Is 79 a reasonable estimate, or total for all of the markers?
Explain.
No, because 30 + 20 is 50 and that isn't close to 79.
Break apart 23 into tens and ones.
23 = 2 tens and 3 ones
10. Ted has 52 cards in a box. Tyrone has 48 more cards than Ted. How many cards does Tyrone have? Use a hundred chart to solve.
100
7. Part A
Show how you can use an open number line to find 44 + 27.
44 + 27 =
44 + 27 =71
11. Which are equal to 47 + 25? Choose all that apply. Use a hundred chart to solve.
40+ 20 +7+5
40+20+12
50+12
50+22
40+ 20 +7+5
40+20+12
50+12
13. Which numbers round to 40 when they are rounded to the nearest ten? Choose all that apply. Use the number line to help.
41
46
42
44
48
41
42
44
Round to the nearest ten. Circle the numbers that round to 30.
33
22
25
38
33
25
12. Emma has 46 rocks. She gets 25 more rocks from Gus. How many rocks does Emma have now? Use the hundred chart to solve.
71
16. Show two different ways to find 28+49 using a number line (not compensation).
Example:
49+10+10+1+7=77
49+20+1+7
14. Break apart the second addend into tens and ones to find 56 + 38. Show your work.
56+38=
56+30=86
86+8=94
Performance Task
4. Lucas sells 28 more boxes than Nancy. How many boxes does Lucas sell?
Part A Estimate the solution. Show your work.
Part B Solve to find how many boxes Lucas sells. Use your estimate to check your solution. Is your solution reasonable? Show your work.
19+28=
Part A 30+20=50
Part B 28+10=38 and 38+2=40 and 40+6=46
Yes, the solution is reasonable because 46 rounded to the nearest ten is 50 and my estimate was 50.
Use an open number line to find 38 + 23. Add the tens and then add the ones.
What is 38 + 20= 58 and 58 + 3 = 61?
Performance Task
2. James says that Mary and Nancy sold more boxes in all than Darnell and Ted sold in all. Do you agree with him? Explain your answer.
Use a hundred chart to solve.
Mary and Nancy sold 34+19=53.
Darnell and Ted sold 28+21=49.
Yes, I agree with James because Mary and Nancy sold 53 boxes of popcorn and Darnell and Ted only sold 49 boxes which less than 53.
1. How many boxes of popcorn do Ted and Mary sell in all? Use the open number line to solve. Show your work.
34 + 10+10+1=55
or
34+20+1=55
15. Write an equation to solve each part of the two-step problem.
Ken has 45 stamps.
He uses 20 stamps.
Then he buys 7 more stamps. How many stamps does he have now?
45+20=65
65+7=72
Performance Task
3. Which two students sold a total of 77 boxes? Use any strategy to solve.
Circle the names of two students.
Strategies:
Hundred chart
number line
break apart numbers
43+28=71 Mary and Elena