Instructions
Hi River! Let's practice with number bonds.
Remember, in a number bond, the top number is the whole and the two numbers connected to it are the parts. The two parts always add up to make the whole.
- Look at each number bond puzzle below.
- Ask yourself: "Is the whole number already given at the top?" If the whole is there, you need to subtract to find the missing part.
- With your pencil, draw a circle around all the puzzles where you need to subtract.
- Now, go back and solve only the problems you circled by writing the missing number in the empty box. You can ignore the other ones!
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[ 100 ]
/ \
[ 45 ] [ ? ]
|
[ ? ]
/ \
[ 50 ] [ 60 ]
|
[ 250 ]
/ \
[ ? ] [ 100 ]
|
|
[ ? ]
/ \
[ 110 ] [ 20 ]
|
[ 88 ]
/ \
[ 30 ] [ ? ]
|
[ ? ]
/ \
[ 250 ] [ 150 ]
|
|
[ 345 ]
/ \
[ 120 ] [ ? ]
|
[ ? ]
/ \
[ 35 ] [ 45 ]
|
[ 720 ]
/ \
[ 500 ] [ ? ]
|
Answer Key
Problems to Circle and Solve (The Subtraction Problems):
You should have circled the five problems below. Here are the answers for them.
|
[ 100 ]
/ \
[ 45 ] [ 55 ]
(100 - 45 = 55) |
[ 250 ]
/ \
[ 150 ] [ 100 ]
(250 - 100 = 150) |
[ 88 ]
/ \
[ 30 ] [ 58 ]
(88 - 30 = 58) |
|
[ 345 ]
/ \
[ 120 ] [ 225 ]
(345 - 120 = 225) |
[ 720 ]
/ \
[ 500 ] [ 220 ]
(720 - 500 = 220) |