Back to Exercise: Substitution and Evaluation

Exercises: Substitution and Evaluation

Substitute the given value(s) in brackets before computing, and follow the order of operations.

Grade 7·18 problems·~27 min·Uganda NCDC Primary 7 Mathematics·lesson·algebra-02

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Recall / Warm-Up

Review substituting a single value before mixing in more operations.

If $x = 5$ , what is $3x$ ?

$8$

$15$

$35$

If $y = 8$ , what is $y + 7$ ?

Evaluate $2 + 3 \times 4$ using the correct order of operations.

Fluency Practice

If $l = 6$ and $w = 4$ , evaluate the perimeter expression $2l + 2w$ .

If $x = 3$ , evaluate $5x - 2$ .

If $a = 4$ , what is $3a + 5$ ?

$27$ — adds $a$ and $5$ first ( $4+5=9$ ), then multiplies by the coefficient $3$ : $3 \times 9 = 27$ , treating the coefficient as if it applied to the whole sum

$17$ — multiply $3 \times 4 = 12$ first, then add $5$ : $12 + 5 = 17$

$35$ — reads $3a$ as the two-digit number $34$ formed by writing $3$ next to the substituted $4$ , then adds $1$

If $a = 4$ , evaluate $2a^2$ .

If $a = 2$ , evaluate $a^2 + 3a$ .

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