Follow The Decade Rules - Challenge Worksheet With Answer Key
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1
2Name
Date
3–2
3–4
Follow the Decade Rules
Use the rule in the box. Add.
Number
Number
Number
Number
Number
Number
In
Rule
Out
In
Rule
Out
In
Rule
Out
90
80
70
40
50
100
+10
+40
+50
30
50
30
20
100
10
Write the rule.
Number
Number
Number
Number
Number
Number
In
Rule
Out
In
Rule
Out
In
Rule
Out
60
80
10
70
20
50
40
60
60
120
40
70
90
110
30
90
50
80
50
70
50
110
90
120
Use tens to think of an addition rule. Write the numbers.
Trade papers with a classmate. Find the rule.
Number In
Rule Number Out
Number In
Rule Number Out
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