Emek and Luna built a bridge with 10 blocks across a little stream. When Emek tested it, the bridge wobbled. They found 2 loose blocks and removed them. Luna counted the 8 blocks that remained. Then they saw one spot that needed another block. Emek added 1 strong block, making 9 blocks in all. They checked the bridge again. This time it stayed still, and they crossed the stream safely.
Challenges
Challenge 1 of 5
Challenges
Challenge 1 of 4
Hint
The loose blocks were taken away, so think about subtraction.
The bridge started with 10 blocks. Emek and Luna removed 2 loose blocks. Which number sentence shows how many blocks remained?
10 + 2 = 1210 - 2 = 810 - 1 = 98 + 2 = 10Correct! Taking 2 blocks away from 10 leaves 8.
Think about what happens when 2 blocks are removed from 10.
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Hint
Start at 8 and count on 1 more.
After the 2 loose blocks were removed, 8 blocks remained. Emek added 1 strong block. How many blocks were on the bridge then?
Correct! Adding 1 to 8 makes 9.
Start with 8 blocks and add 1 more block.
Next🎉 Congrats! You got this question!
Hint
Compare 10 blocks with 9 blocks. How much smaller is 9?
The bridge had 10 blocks at first and 9 blocks when it was finished. Which statement is true?
The finished bridge had 2 more blocks.The finished bridge had the same number of blocks.The finished bridge had 1 more block.The finished bridge had 1 fewer block.Correct! The finished bridge had 1 fewer block than it had at first.
Compare 10 and 9. Think about how many blocks you take from 10 to get 9.
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🎉 Congrats! You finished this challenge set!
