Fill in the blanks with numbers, and boxes by signs, so that the expressions on both sides are equal. (a) 3 × (6 + 7) = ☐ (b) (8 + 3) × 4 = ☐ (c) 3 × (5 + 8) = ☐ ___ (d) (9 + 2) × 4 = ☐ ___ (e) 3 × (___ + 4) = 3 × ___ + ___ (f) (___ + 6) × 4 = + ___ (g) 3 × (___ + ) = + (h) ( + ___) × ___ = + (i) 5 × (9 - 2) = ☐ 5 × ___ (j) (5 - 2) × 7 = ☐ 2 × ___ (k) 5 × (8 - 3) = ☐ ___ (l) (8 - 3) × 7 = ☐ (m) 5 × (12 - ___) = ___ ☐ 5 × ___ (n) (15 - ) × 7 = ___ ☐ (o) 5 × ( - ) = - (p) ( - ___) × ___ = -
-, 2
+,
+,
Any number a, then 3 × a +
13, then
5 and 2
(2 + 3) × 4
-, 7
-,
Any number a, then - 5 × a
6, then -
9 and 4
(17 - 9) × 7
Explanation
(a) Distributive property: 3 × (6 + 7) = + (b) Distributive property: (8 + 3) × 4 = + (c) 3 × (5 + 8) = + (d) (9 + 2) × 4 = + (e) 3 × (a + 4) = 3 × a + 12 (f) (13 + 6) × 4 = + (g) 3 × (5 + 2) = + (h) (2 + 3) × 4 = + (i) 5 × (9 - 2) = - (j) (5 - 2) × 7 = - (k) 5 × (8 - 3) = - (l) (8 - 3) × 7 = - (m) 5 × (12 - a) = - 5 × a (n) (15 - 6) × 7 = - (o) 5 × (9 - 4) = - (p) (17 - 9) × 7 = -