Multiplication par des multiples de 10 – 100 – 1000 ou par 0,1 – 0,01 – 0,001 : 8eme Harmos – Exercices corrigés
Exercice 1 : Calcul mental
- 4,192 x 1 000 = ______________________
- 1,14 x 10 000 = ______________________
- 0,43 x 100 = ________________________
- 182,1 x 10 000 = _____________________
- 0,1 x 1 000 = ________________________
- 91,21 x 100 = _______________________
- 100 x 100 = _________________________
- 4,67 x 10 000 = ______________________
Exercice 2 : Calcul mental
- 53,53 x 1 000 = ______________________
- 61,83 x 100 000 = ____________________
- 9,12 x 100 = ________________________
- 94,43 x 10 = ________________________
- 1,392 x 100 = _______________________
- 7,301 x 10 000 = _____________________
- 9,341 12 x 100 000= __________________
- 353 x 1 000 = _______________________
Exercice 3 : Calcul mental
- 182 x 0,001 = _______________________
- 454,7 x 0,01 = _______________________
- 7,43 x 0,000 1 = _____________________
- 25,32 x 0,1 = ________________________
- 143 205 x 0,000 001 = ________________
- 75,47 x 0,000 1 = ____________________
- 15,931 x 0,001 = _____________________
- 469,28 x 0,000 1 = ___________________
Exercice 4 : Compléter par 10 – 100 – 1 000 – …
a. |
54,09 |
x |
_______ |
= |
540 900 |
b. |
24,9 |
x |
_______ |
= |
249 |
c. |
0,351 |
x |
_______ |
= |
3 510 |
d. |
0,011 |
x |
_______ |
= |
1,1 |
e. |
9,0909 |
x |
_______ |
= |
909,09 |
f. |
382,3 |
x |
_______ |
= |
382 300 |
Exercice 5 : Compléter par 10 – 100 – 1 000 – …
a. |
49,001 |
x |
_______ |
= |
49 001 |
b. |
84,21 |
x |
_______ |
= |
842,1 |
c. |
33,33 |
x |
_______ |
= |
3 333 |
d. |
0,000 02 |
x |
_______ |
= |
2 |
e. |
73,12 |
x |
_______ |
= |
7 312 |
f. |
92,02 |
x |
_______ |
= |
920 200 |
Exercice 6 : Compléter par 0,1 – 0,01 – 0,001 – …
a. |
512,2 |
x |
_______ |
= |
0,512 2 |
b. |
0,02 |
x |
_______ |
= |
0,000 2 |
c. |
9,262 |
x |
_______ |
= |
0,092 62 |
d. |
5 |
x |
_______ |
= |
0,000 05 |
e. |
498 |
x |
_______ |
= |
0,498 |
f. |
0,24 |
x |
_______ |
= |
0,024 |
Correction