A sticky note is hiding a number on our hundred square. The number under it is 35.

What number lives just before 35? What number lives just after?

Now think about the number straight below 35. What could it be?

The hundred square is our number map. Numbers in a row sit side by side. One more steps right. One less steps left.

Now look down a column: 24, then 34, then 44. The units digit stays 4. The tens digit goes 2, then 3, then 4.

Each row is a full group of ten. One step down adds ten. One step up takes ten away. We call those moves ten more and ten less.

I am on 34. Ten more keeps the units digit 4 and the tens digit climbs by one, so I land on 44 straight down. Ten less lands on 24 straight up.

Watch this last one carefully. 60 sits at the very end of its row. One more cannot step right, so it hops to 61 at the start of the next row.

Today we try these moves together on the hundred square. Predict the number you end on before we shade each one:

• one more than 25
• ten more than 33
• one less than 48
• ten less than 72

Today we work through these moves together:

• one more than 27
• ten more than 41
• one less than 60
• ten less than 83