Max Conquers the Olympic Stadium: Adding Tens Sprint!

About this Grade 1 Adding Multiples Of 10 Drill

Adding multiples of 10 is a foundational bridge between counting and true arithmetic for six- and seven-year-olds. When children master 10 + 20 or 30 + 40, they're learning that tens are like single units—a crucial insight that makes later addition, subtraction, and place value click into place. This skill reduces cognitive load: instead of counting by ones, students recognize patterns and use mental math, which builds confidence and speed. At this age, children are developing number sense and beginning to understand that 10 ones can be bundled into one ten. Practicing adding multiples of 10 directly supports their ability to decompose numbers and prepares them for two-digit addition with regrouping. In everyday moments—counting score points at a playground like young athletes do, or organizing items into groups of ten—this skill becomes visible and relevant.

What your student will practice

• Recognize and name multiples of 10 up to 100
• Add two multiples of 10 using mental math strategies
• Apply adding multiples of 10 to word problems with real contexts
• Explain why adding multiples of 10 is like adding single digits

Common mistakes to watch for

The most common error is that students count by ones instead of recognizing the ten-groups. For example, when solving 20 + 30, a child might count 21, 22, 23 instead of thinking "2 tens plus 3 tens equals 5 tens." Another frequent mistake is forgetting the zero at the end—writing 5 instead of 50. You can spot this by asking the child to explain their thinking aloud or show the problem with ten-blocks or drawings. If they're counting on their fingers slowly or hesitating on every problem, they likely haven't internalized the ten-group pattern yet.