Addition Strategies
Subtraction Strategies
Word Problems
Mentally Adding 10 or 100
Adding with 3-digit Numbers
100
Solve using PLACE VALUE: 12 + 13 =
25
100
Solve using PLACE VALUE: 26 - 13 =
13
100
Sarah had fourteen marbles. Her brother gave her twenty-one marbles. Her sister gave her thirty-two. How many marbles does Sarah have now?
67 marbles
100
What number is 10 more than 589?
599
100
612 + 9 =
621
200
Solve using INCREMENTAL ADDITION: 44 + 22
66
200
Solve using INCREMENTAL SUBTRACTION: 76 - 64 =
12
200
Ms. Okihara had eighty-five pencils. She gave thirty-three to Ms. Bay and seventeen to Ms. Malone. How many pencils does Ms. Okihara have left?
35 pencils
200
What number is 10 less than 714?
704
200
134 + 23
157
300
Solve using a FRIENDLY NUMBER: 78 + 21 =
99
300
Solve using ADDING UP: 57 - 36 =
21
300
James had seventy-six books. He donated some to the library. Now he has thirty-nine books left. How many books did James donate to the library?
37 books
300
What number is 10 more than 137?
147
300
286 + 94 =
380
400
Solve using PLACE VALUE: 43 + 27 =
70
400
Solve using INCREMENTAL SUBTRACTION: 67 - 24 =
43
400
Logan has forty-seven balloons. Twenty-nine are blue and the rest are purple. How many balloons are purple?
18 balloons are purple.
400
What number is 100 more than 502?
602
400
478 + 235 =
713
500
Solve using INCREMENTAL ADDITION: 69 + 21 =
90
500
Solve using ADDING UP: 99 - 43
56
500
Mariela has twenty-four basketballs. Jon has fifty-six basketballs. How many fewer basketballs does Mariela have than John?
32 fewer basketballs
500
What number is 100 less than 654?
554
500
187 + 564 =
751
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