PC4 : Premier cours 4e

Conversions

2,33 km= 2 330 000 mm
34,4 dL= 3440 mL
7,29 hm= 72,9 dam
6,12 hL= 6120 dL
4,85 kg= 485 000 cg
69,3 dg= 0,693 dag
7,15 km= 7 150 000 mm
48,8 hg= 4 880 000 mg
9,64 km= 964 dam
15,5 cL= 0,0155 daL
47,2 dam= 0,472 km
49 km= 4900 dam
4,16 dam= 41 600 mm
1,87 dam= 1870 cm
4,57 kg=4 570 000 mg
83,7 dam= 837 m
10,4 g= 0,104 hg
52 cg= 0,00052 kg
32 L= 320 dL
3,05 g= 0,00305 kg
4,48 m= 44,8 dm
9,49 kg= 9 490 000 mg
40,2 hL= 40 200 dL
13,3 cL= 0,00133 hL
2,02 m= 202 cm
6,7 hL= 670 L
9,96 L= 9960 mL
40,7 cL= 0,407 L
1,97 dm= 0,00197 hm
76,9 L= 769 dL

exercices à faire à la maison (corrigés sur le site web)

calcul mental

3 × 8 = 24
56 ÷ 7 = 8
50 ÷ 5 = 10
17 − 7 = 10
5 × 7 = 35
30 ÷ 3 = 10
15 − 8 = 7
8 × 10 = 80
6 + 9 = 15
6 + 4 = 10
6 + 8 = 14
14 − 5 = 9
9 × 10 = 90
5 × 7 = 35
8 + 6 = 14
40 ÷ 10 = 4
7 + 7 = 14
10 ÷ 1 = 10
11 − 6 = 5
18 − 10 = 8
9 − 7 = 2
54 ÷ 9 = 6
13 − 10 = 3
9 ÷ 9 = 1
6 × 8 = 48
6 × 8 = 48
5 + 7 = 12
3 × 4 = 12
8 + 10 = 18
72 ÷ 9 = 8
19 − 10 = 9
30 ÷ 6 = 5
7 + 6 = 13
14 − 6 = 8
7 + 9 = 16
60 ÷ 6 = 10
8 − 4 = 4
7 + 6 = 13
3 × 10 = 30
2 × 5 = 10
3 + 10 = 13

−8 + (-4) = −12
−7 + (−7) = -14
−5 + (-6) = −11
6 − (-2) = 8
−5 + 3 = −2
−5 + (−2) = -7
8 − 7 = 1
2 + (−6) = -4
3 − (−7) = 10
17 − 8 = 9
3 + 3 = 6
2 − 3 = -1
−10 + 3 = -7

−3,6 − (−0,8) = -2,8
6,8 + (−9,3) = −2,5
5 + 9,3 = 14,3
6,9 − 9 = −2,1
9,1 − 8,7 = 0, 4
4,1 + 3,4 = 7,5
10 + (-7) = 3
56 ÷ 7 = 8
7 × 9 = 63
−81 ÷ -9 = 9
−14 − (-10) = −4
6 ÷ 2 = 3
3 + (−5) = -2
-2 − (−1) = −1
4 ÷ (-1) = −4
(-6) × (−5) = 30
−12 − (-6) = −6
3 + (-1) = 2
4 − (−1) = 5
−5 × (-2) = 10
3 × 9 = 27
10 ÷ (-1) = −10
-4 − (−5) = 1
8 + (-4) = 4
−3 + 4 = 1
−8 × (−8) = 64
−7 + 6 = -1
−2 + 1 = -1
3 × (-8) = −24
−9 × (−4) = 36
10 × 3 = 30
4 ÷ (−2) = −2
−5 − (−6) = 1
9 + (−4) = 5
-7 + 1 = −6
−2 × 3 = -6
5 × 10 = 50
2 − 7 = -5
35 ÷ 7 = 5