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Build numbers from 0 to 99 with tens and ones. Link the numeral, counters, and base-ten blocks, and explore regrouping ten ones as one ten.
Learning task
Move the counter and watch the blocks change
3 tens
4 ones
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This interactive model represents whole numbers from 0 through 99. It links the numeral to a tens counter, an ones counter, and base-ten blocks: each tens rod represents 10, and each small cube represents 1. The place-value relationship is number = tens × 10 + ones. For example, 36 is 3 tens and 6 ones, so 3 × 10 + 6 = 36.
A digit’s place changes its value. In 36, the 3 means three groups of ten, while the 6 means six single units. The linked views help learners compare the written number with the quantities it represents. The model focuses on two-digit whole numbers; it is not a general chart for hundreds, decimals, or negative numbers.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
The explore mode begins at 34 unless a shared number sets another value. Increase or decrease the tens place by 10, or the ones place by 1, and watch all three representations update.
From 39, adding one in the ones place makes 40: ten ones become one additional ten. From a number ending in zero, subtracting one borrows a ten and leaves nine ones. The total changes by exactly one.
Practice starts at zero with a target number. Adjust tens and ones, choose Check Answer, and use the difference to decide which place to change. A correct answer enables the next randomly selected challenge.
The exchange mode illustrates that ten unit cubes and one tens rod represent the same quantity. Ask the learner to predict what changes in the drawing and what stays equal.
Reset returns to 34 in explore mode and zero in practice mode. Values stop at the displayed range of 0–99.
Use cases
See how the tool fits into real work and everyday tasks.
A teacher can call out 52, ask students to predict the rods and cubes, then use the display to compare their reasoning before naming five tens and two ones.
A caregiver names a two-digit number and the learner builds it. Switch roles so the learner explains why a change of one ten moves the total by ten.
Build 39 and then 40. Discuss why the ones count resets while the tens count increases, even though the quantity rises by only one.
Q&A
Find concise answers to common questions and confusing cases.
No. Its interactive range ends at 99, so it demonstrates tens and ones for two-digit numbers only.
Nine ones plus one more makes a group of ten. That group is represented as one ten, leaving zero ones; the total moves from 39 to 40.
The score reflects correct checks in this activity. Use the learner’s explanation and ability to predict a new example as additional evidence of understanding.
Notes
Review scope, result limitations, and important precautions before use.
The display is a visual aid for place value, not a full mathematics curriculum or an assessment of mastery. It covers 0–99 and does not model hundreds, decimals, fractions, or negative values. Pair it with objects or written examples when a learner needs to handle quantities outside that range.
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