Back to Substitution and Evaluation — Problem 3 · Task Set 38

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

Work through problems with immediate feedback

Fluency Practice

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 $1$