Understanding 100 More and 100 Less

If Betsy the cow produced 324 cartons of milk yesterday, how many did she produce today after making 100 more?

• 224

• 424

• 324

• 524

Yesterday, 489 eggs were collected. How many eggs were collected today if 100 less were gathered?

• 389

• 489

• 299

• 589

Sammy grew 1030 ears of corn last year. How many did he grow this year after increasing by 100?

• 1230

• 930

• 1130

• 1030

What is the key strategy to find 100 more of a number?

• Add 10 to the tens place

• Subtract 100 from the number

• Increase the hundreds place by one

• Decrease the hundreds place by one

Which tool can help visualize counting by hundreds?

• A calendar

• A number line

• A thousands chart

• A multiplication table