Mixed operations
Missing term addition and subtraction
Recover one missing term in a four-term expression containing two additions and one subtraction. Choose one-digit, two-digit or mixed terms.
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Equality equations
Find one missing number in equations with addition or subtraction on both sides. Select operation pairs and a band for the known numbers.
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Evaluate the complete side first. Find the missing operand that makes the other side have the same value.
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Choose the operations and the amount of support
Choose by the learner’s current skills. Mixing operations adds the task of recognizing a sign before choosing a method, even when the individual numbers are familiar.
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Learning objective
What this activity builds
Interpret the equals sign as a balance between two expressions.
Worked example
8 + ? = 12 − 3
1
The right side equals nine, so the left side must also equal nine: 8 + 1 = 9.
Teaching notes
Make the practice count
- The band applies to the printed known numbers. The missing answer can be negative or outside that band.
- The blank can appear in any of the four operand positions. Check which term is missing before using an inverse.
- Begin with addition = addition if the learner is still developing the balance interpretation.
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Missing number mixed operations
Recover a missing operand in exact addition, subtraction, multiplication and division facts using a selected letter symbol.
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Signed mixed operations
Mix addition, subtraction and multiplication with positive and negative integers, or opt into balanced exact division practice. Choose positive, mixed-sign, or two-negative operands.
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