Subtraction with disks and new groups vertical way
100 - 83
17 (Ms. Knowles will show how to do this one)
46 + 75
1
4 6
+ 7 5
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121
Mr. Roberts graded 57 tests on Friday and 43 tests on Saturday. How many tests did Mr. Roberts grade?
57 + 43 = 100 tests
57 + 32
5 7 (50 + 7)
+ 3 2 (30 + 2)
----------
8 0 (50 + 30)
+ 9 (7 + 2)
-------------
8 9
136 - 94
42 (Ms. Knowles will show how to do this one)
83 + 69
1
8 3
+ 6 9
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1 5 2
There were 35 chocolate hearts for Valentine's Day. 17 of the hearts were broken and were thrown out. 9 hearts were eaten. How many hearts are still on the table?
35-17=18 hearts left
18-9=9 hearts total hearts left
127 + 59
1 2 7 (100 + 20 + 7)
+ 5 9 (50 + 9)
---------------
1 0 0
+ 7 0 ( 20+ 50)
1 6 (7 + 9)
-------------
1 8 6
106 - 67
39 ( Ms. Knowles will show how to do this one)
78 + 15
1
7 8
+ 1 5
------
9 3
Jeremiah collected 27 FEWER coins than Ms. Knowles. Jeremiah collected 58 coins. How many coins did Ms. Knowles collect?
58 +27=85 coins for Ms. Knowles
167 + 48
1 6 7 (100 + 60 + 7)
+ 4 8 (40 + 8)
---------------
1 0 0
+ 1 0 0 ( 60+ 40)
1 5 (7 + 8)
-------------
2 1 5
200 - 143
57 (Ms. Knowles will show how to do this one)
134 + 48
1
1 3 4
+ 4 8
-------
1 8 2
There are 54 girls and 17 FEWER boys than girls in the classroom. How many boys are in the classroom? How many people are in the classroom?
54-17=37 boys
37+54=91 people
483 + 16
4 8 3 (400 + 80 + 3)
+ 1 6 (10 + 6)
---------------
4 0 0
+ 9 0 ( 80+ 10)
9 (3 + 6)
-------------
4 9 9