Step 1 of 4 · Move a 1
Numbers ending in 9 are 1 short of a round 10 · give them a 1 from the other side.
123 + 49  feels hard…
But 49 is just 1 short of 50.
Take 1 from 123 (→ 122) and give it to 49 (→ 50).
Now: 122 + 50 = 172 · easy round number!
Moving 1 from one side to the other doesn't change the total — and round numbers are way easier to add.
Step 2 of 4 · 123 + 49
123 + 49 = ?
123
+
49
needs +1 to make 50!
1
122 + 50 = 172
123 + 49 = 172
Step 3 of 4 · 124 + 59
124 + 59 = ?
124
+
59
needs +1 to make 60!
1
123 + 60 = 183
124 + 59 = 183
Step 4 of 4 · Your turn
Move a 1 to complete the round number.
🏆

Nice work!

You moved the 1.

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