Adding Tens Mentally
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Adding Tens Mentally
📏 How to Use a Number Line for Adding Tens
Step 1: Find your starting number on the number line
Step 2: Count how many tens you need to add (20 = 2 tens, 30 = 3 tens)
Step 3: Make jumps of 10. Draw arrows to show your jumps!
Step 4: Where you land is your answer
🧮 Part 1: Using Number Lines to Add Tens
31——32——33——34——35——36——37——38——39——40——41——42——43
Start at 23, then jump +10, +10
23 + 20 = ____
51——52——53——54——55——56——57——58——59——60——61
62——63——64——65——66——67——68——69——70——71——72——73——74——75
Start at 45, then jump +10, +10, +10
45 + 30 = ____
a) 32 + 10:
Answer: 32 + 10 = ____
b) 54 + 20:
61——62——63——64——65——66——67——68——69——70——71——72——73——74
Answer: 54 + 20 = ____
🎯 Part 2: Easy Steps to Add Tens
Easy Way: Just change the tens digit! The ones digit stays the same.
Step 1: Look at the tens digit in 124. It is 2.
Step 2: Add 3 tens: 2 + 3 = 5
Step 3: Keep the hundreds and ones the same: 1_4
Step 4: Put in the new tens digit: 154
Answer: 124 + 30 = 154
Step 1: The tens digit in 235 is ____
Step 2: Add 2 tens: ____ + 2 = ____
Step 3: Keep 2 and 5 the same: 2_5
Step 4: Put in the new tens digit: ____
a) 143 + 20 = ____
b) 251 + 30 = ____
c) 362 + 10 = ____
💭 Part 3: Word Problems with Number Lines
41——42——43——44——45——46——47——48——49——50——51——52——53——54
Draw your jumps on the number line above
Sam now has ____ marbles.
51——52——53——54——55——56——57——58——59——60——61
62——63——64——65——66——67——68——69——70——71——72——73——74——75——76
Draw your jumps: Start at 46, jump +10 three times
Answer: ____ books
When you add 10 to any number, which digit changes?
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