Make both sides agree.

SparkClass

Count each side, test the equal sign, and uncover the missing number.

CCSS 1.OA.D.7–D.8
Live Equation
True · 7 = 7
A balance comparing the value of two expressions The left pan has 6 coral counters and 1 yellow counter. The right pan has 5 teal counters and 2 yellow counters. Both sides total 7, so the beam is level.
The heavier value tips down
01

Both sides total 7. The equation is true, so the beam is level.

Left Side Value7
=
Right Side Value7
EquationTrue

Teacher notes — Equation Balance

Keep the focus on the value of each complete side. The equal sign is a relationship, not an instruction to calculate.

1

Value before vocabulary

In Build mode, ask students to cover the center symbol and name each side’s total. Then ask whether the equation is true and how the counters prove it.

2

Predict the tip

Change just one addend. Before moving the slider, ask which pan will drop and why. A level beam represents equal values; a tilt shows which value is greater.

3

Make the unknown meaningful

Use all three challenge types: a missing addend, a missing minuend, and an unknown on the right. For guesses below 3 in 5 = □ − 3, the lab says “not enough to take away” and never creates negative counters.

CCSS alignment: 1.OA.D.7 — understand the meaning of the equal sign and determine whether equations are true or false. 1.OA.D.8 — determine the unknown whole number in an addition or subtraction equation.